Releases · Calculingo

1.250.42 August 2026

An answer that was one word long and a hundred characters wide

pi to 42 placesoff the side of the pagewrapped
pi to 100 places…and the page scrolled sidewaysfive lines
Reported. Almost every answer here is short enough that none of this came up, and the ones that are not are a single unbroken run of digits: a hundred decimal places of π is a hundred-character word, and a word is exactly what a browser treats it as, so there was nowhere in it to wrap and it went out of the right-hand side. The cost was not only the answer. The document itself grew a horizontal scrollbar, which moved the nav, the examples and the footer sideways along with it, none of which were too wide for anything. Long runs now break inside themselves. Ordinary answers are untouched, since a line still prefers to break between words and only splits a word that could not fit on a line of its own.
The same number one Enter later had the same problem for a different reason. In the saved list the answer sits beside the query and was set never to shrink, which is right when it fits and is why the query is the half that gives way; when it does not fit, a thing that cannot shrink simply hangs out of the row. It may now give way too, which costs nothing on any answer with room, because an item only shrinks when there is not enough space to go round.

1.250.31 August 2026

The sum that was confident about a line it had only partly read

1+2+3+...+100106nothing
1+2+...+1013nothing
3++477
The arithmetic reader gathered up the pieces of a line it recognised and never asked what it had walked past. A character it had no token for was dropped and the rest closed over the gap, so "1+2+3+...+100" lost its ellipsis, arrived at the parser as "1+2+3++100" and answered 106. That is the one answer shape this file is built to never produce. A silence is visibly a silence and somebody types something else; a wrong number is indistinguishable from a right one at the moment it matters, and 106 is a real total of real numbers that were really on the line. Every character now has to have become a token or the line is not read at all. What it does not do is add the run up: summing 1 to 100 is a reader this could grow and would be new grammar, and not having it is not a licence to answer as though the dots had never been typed. A doubled sign is untouched, since the second one is a sign and not a hole, and "3++4" has been 7 throughout.

1.250.21 August 2026

The list that could not be scrolled, and the row that was the word you had just typed

150 kw in hnothing offeredhp · horsepower
150 kw in ↓the key did nothingbrowses the list
100 usd in euran empty box over the answerthe answer
Three faults, all reported, and all in one place: which half of the line an offer replaces. That was being worked out three times over. The list worked it out to draw itself, a pick worked it out again to take one, and the arrow keys worked it out a third time, and only the first of the three asked both of the sources a list can come from. The arrows asked the currency reader alone and gave up when it said no, so every list that came from the general one, which is every list about a unit or a half-typed question, could not be arrowed through at all. Worse than nothing happening: the key had already been claimed by the time it gave up, so it did not fall through to the history either, and the one press did nothing in both directions at once. It is one fact now, settled where the list is built and read from there by all three.
The currency list ranked an exact match first, so the word already in the box led the list that was supposed to be finishing it. A row that replaces the text it is made of changes nothing, and when it was the only match it cost more than a wasted row: the leading offer is drawn up in the line rather than in the list, and the row it came from is skipped there, so a one-row list rendered as an empty box, standing over the answer it had just hidden behind itself. Nothing typed in full is offered back now, compared against the label rather than the code so that "eur" and "euro" go the same way, and a list left with nothing to say closes instead of standing there empty.
And it closed on the one keystroke it was there for. Nothing read a partial word after a connector, so "150 kw in" offered four units and "150 kw in h" offered none, which is the moment somebody had started typing the word they wanted. The narrowing was never the hard part, since an offer that does not start with what was typed has never reached the run, and one that matches it exactly is not an offer. There was simply no reader for that shape.

1.250.11 August 2026

The one operator whose meaning is its working

4!2424, and 4 × 3 × 2 × 1
10!3,628,800…and ten numbers multiplied
0!1an empty product, which is 1 by definition
20!2,432,902,008,180,000,000…with the middle elided
"4!" came back "24" and nothing else, which is the answer and none of the reason. Reported, and it is a fair complaint about this one operator in particular: a factorial is the only mark on this page whose meaning is its working. It says "multiply this by everything under it", and anybody who has to look that up has to look up exactly the line that now gets printed underneath. Nobody needs to be told what the plus did. Elided past a dozen terms, since 20! is a screenful of multiplication and the shape is clear from either end of it. Nought and one are told apart, too: nought is the empty product and one is not, there being nothing to multiply in the first and exactly one thing in the second, and calling them both empty would be wrong about the interesting one.

1.250.01 August 2026

It knew the word you were reaching for and made you type it

150 kw incan't read that yethp · w · mw · ps
32 GB at 100 mbcan't read that yetmbps · mbytesec
1 cup incan't read that yetl · ml · tbsp · tsp
how fcan't read that yethow far is tokyo from london
The grey completion has finished a city name since it went in. This finishes the question, which is the other half of the same problem and much the larger one. Somebody who types "150 kw in" has told this page everything it needs except the one word it could supply itself: there are four units it converts a power into and no way to know from the outside which of them it spells which way. The page sat there saying "can't read that yet", which was true and was not help. One rule is the whole design: every offer is run before it is shown, and only the ones that answer are offered. Nothing in the suggester knows anything about the grammar. It proposes, the readers dispose, and a suggestion therefore cannot lead anywhere but to an answer. That is also what keeps it from rotting, since a reader that stops answering stops being suggested without anybody having to remember this exists. It is why a word typed after a number is offered across every dimension at once rather than a guessed one: "32 GB at 100 mb" could be going to mb, mbit, mbps or mbytesec, all four are run, and the two that answer are the two offered, without the suggester ever being told what a download is. The unit the line is already in is never offered back, compared by the unit each spelling lands on rather than by its letters, so "1 cup in cups" goes the same way "20 km in km" does. And "when will the sun rise in tokyo" answers now, because the suggester tried to offer it, the run said no, and the reader that should have taken it was missing a tense.

1.249.01 August 2026

The longest night, the last day of a week, and the tense a question was asked in

longest night in bostonnothingTue, 22 Dec 2026 · 14h 45m
last day of week 30nothingSun, 26 Jul 2026
what day was it 256 days agonothingMonday
what day will it be in 100 daysnothingSunday
Three reports, and every one of them is a question this page could already answer being asked in words it had no slot for. The longest night is the shortest day, which this file knew and could not be told: being told the day is nine and a quarter hours is little use when the thing being planned around is the fourteen and three quarters of darkness, so the night is now counted and printed as a night, sunset first. A week is a stretch to count days in and was the only stretch that could not be counted in, though the page prints an ISO week number on every date it gives. Which end a week opens on is said out loud, because the two halves of the world disagree: ISO runs Monday to Sunday, which is what the numbering is defined in, and an American calendar runs Sunday to Saturday, so the same numbered week ends on a different day depending on who printed it. And the pronoun: on its own "it" is the whole of "what day is it" and means today, and with a date behind it the word is left over from the sentence, so the date engine was handed "it 256 days ago" and answered nothing. English also puts that pronoun between the two halves of a verb, and there was no slot for it there either.

1.248.01 August 2026

Three answers that knew more than they were saying

0x8fb + 482,3472,347, and 0x92B
15 last primes under 282nothing199 … 281, fifteen of them
first 15 primesnothing2 · 3 · 5 · 7 · 11 …
in 18 days after halloweennothingWed, 18 Nov 2026
Three reports, and all three are the answer knowing more than it said. A sum written in hexadecimal came back in decimal and stopped, which answers a question nobody asked in that form: somebody adding to 0x8fb is working in hex and wants 0x92B. The decimal stays the headline, being the one every reader can check, and the operands go underneath in both, since a wrong-looking total in hex is nearly always one literal being read as something other than what was meant. A list of sixty primes gets topped and tailed with an ellipsis, which is right until somebody says how many they want, and "15 last primes under 282" is a question with its own answer size in it. Said at either end and in either order, and with no bound at all once a count is given, the sieve doubling its reach until it has them. And a leading "in" was stopping an anchored length dead: "in 18 days" reads on its own, so the same words with a date behind them reading as nothing was the offset reader wanting a sign and then a count, and finding that word sitting between the two.

1.247.01 August 2026

An age is reached in a year, and only one year could be named

what year was i born if i was 36 in 1996nothing1959 or 1960
born if i was 40 in 2000nothing1959 or 1960
what year was i born if aged 36 in 1996nothing1959 or 1960
what year was i born if i am 361989 or 19901989 or 1990
Working back from an age only ever counted from today, so the year the age was actually reached had nowhere to go. That year is the whole point of the question: "36 in 1996" is how anybody works backwards from a fact they already have, a photograph, a record, something somebody once said. Asked with the year in it, the line answered nothing at all. Two years still come back, because half a year of birthdays is the difference between them and one number would be wrong half the time without ever looking wrong. The wording follows the year now, though: asked about a year that has gone, both halves are settled, and saying "if the birthday has been this year" about 1996 would be the answer pretending the birthday is still coming.

1.246.01 August 2026

Which Darwin, which Valencia, which Portland

darwin9:30 am in Darwin…and Darwin, Northern Territory
valencia2:00 am in Valencia…and Valencia, Spain
portland5:00 pm in Portland…and Portland, Oregon
monaco2:00 am in Monacounchanged, being Monaco
A clock answer named a city and stopped, and half the cities anybody types are two cities. There is a Darwin in Australia and a Darwin in England, a Valencia in Spain and one in Venezuela, a Portland at each end of the United States. The answer was correct and gave the reader nothing to check it against, which is the one thing this page tries never to do. Where the place is now leads the detail line. The region where a region is how the place is actually said, since an Australian says Darwin, Northern Territory and an American says Boston, Massachusetts, and the country everywhere else, because a Spaniard does not say Valencia, Valencian Community. Nothing at all when the name would only repeat itself: Monaco is not in Monaco, it is Monaco, and "New York, New York" is a song rather than information. None of it can go stale for the reason the coordinates cannot, a city not moving and a state line moving rather less often than that.

1.245.01 August 2026

The unit on the end was asking the question and nothing was listening

istanbul to monaco kmnothing1,793.51 km
istanbul to monaco milesnothing1,114.43 miles
tokyo to london in milesnothing5,943 miles
istanbul to monaco2:00 am in Monaco2:00 am in Monaco
Two places with a length unit after them can only be one question, and it was the one shape of it that answered nothing. Reported. The trailing word was already how "tokyo to london distance" gets read, and a unit does that job and more, since it says which unit to answer in as well as which question is being asked. It is a weak keyword like the other one and safe for the same reason: it answers only when what is left of the line turns out to be two places, so a pair with nothing after it is still a clock question, "3pm new york to tokyo" is untouched, and a unit of the wrong kind puts the line back where it was.

1.244.01 August 2026

Every base converted and a letter did not

65 in asciinothingA
a in asciinothing97
hello in binarynothing01101000 01100101 …
32 in asciinothingspace
"65 in ascii" is the same question as "65 in hex" asked about a different alphabet: a number written in another set of symbols, and this set has twenty-six of them and a shift key. Both directions, because a byte in a hex dump and a letter in a table are one fact seen from either end. Said in code points rather than bytes, since that is what a character is, and the bytes get their own line and name their encoding, a byte count that does not being one nobody can check. The codes that print nothing say what they are instead of answering with blank space and looking broken. And the base rules keep every line they can read: one word or quoted, and nothing that is already a number, so "ff in binary" is still 255 written out and only "ff" in quotes is two letters.

1.243.01 August 2026

Three kinds of radiation, and none of them turns into another

1 sv in usvnothing1,000,000 usv
1 sievert in graynothingradiation dose is not absorbed dose
1 tesla in gaussnothing10,000 gauss
1 newton in lbfnothing0.224809 lbf
Four dimensions the table had no entry for, and the radiation one is the reason to be careful. Radiation is three quantities that get called one thing: how much is happening is becquerels, how much energy landed in the body is grays, and how much harm that does is sieverts. So they are three separate dimensions here and this file will not turn one into the next, which is exactly what a single lumped-together table would have done quietly. Force went in under the pressure that was already here, a pressure being a force over an area. Two clashes had to be settled and both went the same way, to whoever asks more often: "rem" stays the browser's font size and "rad" stays the angle, since a page is what this file measures most of the time, and the radiation reading is worked out under the refusal instead. "mT" stays Mountain Time, because "3pm ct to mt" is asked every day of the week and a millitesla has never once been typed into a calculator.

1.242.01 August 2026

A0 is a square metre, and that fixes all thirty-three of them

a4 in mmnothing210 × 297 millimeters
a4 in inchesnothing8.26772 × 11.6929 inches
c5 envelopenothing162 × 229 millimeters
letter in mmnothing215.9 × 279.4 millimeters
A file that converts every length there is could not be asked for the commonest pair of them, because a paper size is not a length: it is two of them under a name, and the name was the part with no reader. The A series is a rule and not a table, which is the whole reason it belongs here. A0 is one square metre with its sides in the ratio of the square root of two, and those two facts fix both sides exactly, at 841 by 1189 millimetres. Halving the long side gives the next size and keeps the ratio, which is why a folded sheet is the same shape it was and why A4 to A3 is a clean two hundred per cent on any photocopier in Europe. B is a metre across, C sits between the two, and that is what makes a C4 envelope hold an A4 sheet. The rounding has to be done the standard's way rather than the obvious way: the nought is the arithmetic to the nearest millimetre and every size after it is the one above halved and rounded down, one step at a time, off the size that was already rounded. Done in one jump instead, A5 comes out 149. The American sizes are a table, because a letter is eight and a half inches by eleven for no reason but that it is.

1.241.01 August 2026

A slash read and the word it stands for did not

6 GB at 45 mb per secondnothing17 minutes 47 seconds
6 GB at 45 mb per secnothing17 minutes 47 seconds
how long to download 6 gb at 45 mbpsnothing17 minutes 47 seconds
6 GB at 45 MB per secondnothing2 minutes 13 seconds
The rate rule took "mbps", it took "mb/s", it took "/sec" and "/second", and it did not take the word "per" spelled out, which is the only one of those anybody says out loud. So the sentence copied off a speed test answered and the sentence spoken by a person did not. Reported, and it is the same shape as most of what turns up here: the arithmetic was already right and one spelling of the question was missing. The capital is still the byte either way, so 45 MB per second is eight times the file in an eighth of the time, which is the whole reason this section exists. And the question may bring its own words now: "how long" is a date question everywhere else on this page, so naming the verb is what makes it safe to take, no date query having ever downloaded anything.

1.240.01 August 2026

It could do trigonometry and it could not do the area of a circle

area of a circle with radius 5nothing78.5398163397
volume of a sphere radius 5nothing523.598775598
area of a rectangle 10 by 12nothing120
hypotenuse of 3 and 4nothing5
Three multiplications and a constant, and it is the sum this page is asked for more than the trigonometry and the combinatorics that were already here. The arithmetic was never the hard part, which is true of most of what has been missing: there was no shape of sentence to ask it in. Only the shapes people type. A cone, a trapezium and a regular hexagon are formulas somebody looks up once and does not come back for, where a circle, a rectangle and a triangle are the three asked in a kitchen, a garden and a hardware shop. A diameter is what anybody measures and a radius is what every formula wants, so the halving gets done and then said out loud. A dimension may carry a unit, and then the answer carries its square or its cube, because an area in bare numbers is an area somebody has to remember the units of. And a measurement the shape has not got is said rather than left silent: a circle has no volume, and the line was understood, only the pairing was wrong.

1.239.01 August 2026

Nobody runs in kilometres an hour

5 min/km in min/milenothing8:03 min/mile
marathon at 5 min/kmnothing3:30:58
10k at 5 min/kmnothing50:00
pace for a 4 hour marathonnothing5:41 min/km
A pace is a speed written upside down, and it is the way the number is actually said: minutes a kilometre is what the watch shows and what a race gets planned in. This file has turned a distance and a time into a speed since the units went in, and had no way to say the same fact the other way up, so the reader asking got the one form nobody uses. Three questions, and they are the three a runner asks. What this pace is in the other unit, a mile and a kilometre being the two the sport is split between. How long a distance takes at it. And the whole thing backwards: what pace a target time needs, which is the one asked in front of a race and the one nobody does in their head, since it is a division into minutes and seconds. "10k" is ten thousand by the time the reader sees it, the size word and the unit being the same thousand, so reading the bare number as metres is right rather than lucky, and the detail line says which reading it took.

1.238.01 August 2026

Two units it already read, and a division it could not be asked for

bmi 70 kg 180 cmnothing21.6, a healthy weight
bmi for 180 lb and 6 ftnothing24.4
bmi 12 stone 5 ft 10 innothing24.1
what is my bmi if i am 180 cm and 70 kgnothing21.6
A weight over the square of a height, and both of those are units this file has read in every spelling since the day the units went in. What made it unanswerable was the shape: the two numbers arrive in either order and in either system, so the reader takes whatever quantities are in the line and sorts them by what they measure rather than by where they sit. Lengths add up, which is what makes "6 ft 2 in" one height and not two, and weights add up for the same reason, which is what makes stones and pounds work. The band goes underneath, and one clause on what the number is not: a ratio of two measurements, and no more than that. Said once and briefly, because a calculator that lectures is a calculator nobody reads twice.

1.237.01 August 2026

The number to divide a salary by is the thing being argued about

50000 a year in hourlynothing24.04 an hour
25 an hour is how much a yearnothing52,000.00 a year
60000 a year in monthlynothing5,000.00 a month
40 hours at 25 an hournothing1,000.00
This is the sum anybody does while they are looking at a job, and it was answering "there's no month 0" until the date reader let go of round numbers a few releases ago, then nothing at all. It is a division, and not one anybody can do in their head, because the number to divide by is the thing being argued about. So it is said out loud rather than assumed quietly: forty hours a week and fifty-two weeks a year is two thousand and eighty hours, which is what an hourly rate is quoted against, and it counts no holiday, so a year with a fortnight off in it is two thousand hours and a different answer. The detail line names the week it used, because an assumption nobody can see is an assumption nobody can disagree with. Any two periods from an hour to a year, either direction, and the shift multiplication that goes with them.

1.236.01 August 2026

Twenty per cent off and then ten more is not thirty per cent off

20% off 200 then 10% offnothing144, 28% off in all
20% and 10% off 200nothing144
200 less 20% and 10%nothing144
50% off 100 then 50% offnothing25, and not free
A further ten per cent off an already reduced price is twenty-eight per cent off, because the second cut comes off what the first one left, and the gap between that and thirty is the whole reason anybody asks. This file could take one percentage off a number and had no way to take two, so the question with the mistake built into it was the one question it would not answer. The rate they add up to is on the detail line beside the rate they actually come to, and the two prices are shown in the order they happen. Said in three orders, because the discounts get written before the price as often as after it, and two rates only: three is a sentence nobody says, and the second one is where the arithmetic goes wrong.

1.235.01 August 2026

A tip has been read since the first week and a tax was never read at all

20% vat on 100nothing120.00, 20.00 VAT
8.25% sales tax on 45nothing48.71, 3.71 tax
120 including 20% vatnothing100.00, 20.00 VAT in it
remove 20% vat from 120nothing100.00
Both are a percentage added to an amount, and the one that gets typed by everybody who has ever sent an invoice was the one with no reader. The sum was never the difficulty: the answer is two numbers, the total and the part of it that is the tax, and a calculator hands back one. The way back out is the half worth having. Adding a fifth is a sum anybody can do in their head, and finding what a fifth was added to is a division by 1.2 that nearly everybody gets wrong by taking a fifth off instead, so a hundred and twenty inclusive comes out ninety-six rather than a hundred. The echo shows the 1.2, which is what says why in one line. VAT, GST, HST or plain tax, and the answer says back whichever word was typed.

1.234.01 August 2026

A type size was told about beer

12 point in inchespoint isn't a unit I know0.166667 inches
1 point in mmpoint isn't a unit I know0.352778 mm
12 pt in mmpt is volume, mm is lengththe same, with 4.23333 mm under it
1 pica in pointspoints isn't a unit I know12 points
The typographic point has been in this file since the screen units went in, under the name "csspt", which is a name nobody has ever typed. Spelled the way it is written everywhere else it came back "point isn't a unit I know", from a file that knew it perfectly well. A pint is "pt" or "pint" and is never "point", so the plain word costs the volumes nothing and it is what anybody setting text writes. "pt" itself stays the pint, because a unit that is sometimes a drink is a unit that is sometimes wrong, but it no longer stops dead: the refusal is still the pint's and the type size is worked out underneath it, which is the same shape the ounce got when a drink was being measured in it.

1.233.11 August 2026

A day's food came to eight and a third kilojoules

2000 calories in kj8.368 kj8,368 kj
300 calories in kj1.2552 kj1,255.2 kj
1 cal in j4.184 j4.184 j
There are two calories and one word for them. The small one is fixed at 4.184 joules and the one on the back of a packet is a thousand of those, and this read the word as the small one, so two thousand of them came to eight and a third kilojoules: a day's food, out by a factor of a thousand, said with a straight face and no sign that a choice had been made. The capital is what tells the two apart on a label, and a search box is where a capital goes to die. So the word spelled out is the packet's now, whatever its case, and the abbreviation stays the physicist's, because "cal" is who writes it. The echo names which of the two it read, either way.

1.233.01 August 2026

Three weeks ago read and two hours ago did not

2 hours agonothing6:00 pm
in 30 minutesnothing8:30 pm
half an hour agothere's no day 07:30 pm
30m agonothing7:30 pm
an hour agonothing7:00 pm
A length with nothing on the other end of it is how the question gets asked, and the day units have read it both ways round since they went in: "3 weeks ago" and "in a week" are both on the front page. The clock units read neither. The same question answered the moment it was wrapped in something longer, so "what time was it 2 hours ago" worked and "2 hours ago" did not, and the shortest way to ask was the one way that failed. Two of them were worse than silent: "half an hour" becomes "0.5 hour" before any reader sees it, and the date engine took "0.5 hour ago" and answered "there's no day 0", about a month nobody typed. Three smaller things went with it. An article is a number, because "an hour" is how anybody says one. "ago" is not a noun, so "30m ago" stopped being thirty million of something. And the day units are untouched, since the clock reader takes hours, minutes and seconds and no other word: "in 3 days" is a date and stays one.

1.232.21 August 2026

Twelve thousand three hundred and forty five was the first of May, 1234

12345289,356 days ago, 1234-05-01nothing
45001in 903,406 days, 4500-01-01nothing
10000000there's no month 0nothing
17760704Thu, 4 Jul 1776Thu, 4 Jul 1776
The round amounts stopped naming a month that does not exist last release. The ones that are not round were the other half of it, and they were worse than an error: they answered. A five-digit run is a year with a month after it, so 12345 was the 1st of May 1234 and 45001 the 1st of January 4500, stated with the weekday and the week number and every confidence a real date gets. Writing a date with nothing between its parts is how a machine writes one, and those are written in this era, so a packed run now has to name a year in it. Any year at all is still writable with separators, and the eight-digit form keeps the full range, because 17760704 is a date and not a price.

1.232.11 August 2026

Every round number anybody writes down was a month that does not exist

50000there's no month 0nothing
250000there's no month 0nothing
300000 at 6% over 30there's no month 0nothing
100000there's no month 0nothing
A run of five or six digits is read as a year with a month after it, which is how 202607 means July. Every round amount has that shape too, and its last digits are a nought: a salary, a deposit, a house price, a loan. So typing one came back "there's no month 0", an error about a date, for a line with no date anywhere in it, sending the reader to look at the wrong half of what they typed. A bare number says nothing here, and this was the one shape that had been getting out of that rule. Digits that name no month were never a date.

1.232.01 August 2026

Saying who was born was enough to make the question unanswerable

when do i turn 40 if i was born 5 jun 1990nothingWed, 5 Jun 2030
40th birthday if i was born 15 jun 1990Jul 2026 has only 31 daysSat, 15 Jun 2030
when do i turn 40 if my dob is 5 jun 1990nothingWed, 5 Jun 2030
what year was i born if i was 36nothing1989 or 1990
The three readers that point the age arithmetic somewhere other than today let "if" be followed by nothing except "born", so the two words anybody actually says were the two that made the question unanswerable. The plain age reader beside them had taken them since it was written: "how old am I if I was born 5 jun 1990" has always worked, so the file disagreed with itself about the commonest words in the sentence and gave the reader no way to tell which ones were wrong. The birthday one was worse than silent. It fell through to the date grammar, which read "40th" as a day of this month and said so, an error about a number nobody typed. All three share one clause now: a connector, whose birth it is, and the birth named as the verb or as the noun the form asked for. The subject may be left out but its verb may not, so "if my son was born" is a birth date and "if my son" is still nothing, which is what keeps this from answering questions it has not read.

1.231.11 August 2026

A birthday after a colon answered the date and saved nothing

andrei: 02/06/199710,652 days ago, and no name keptandrei = 02/06/1997, kept
andrei to nowcan't read that yet10,644 days
salary: 50000 usdthere's no month 0salary = 50000 usd, kept
The colon named a bare number and nothing else, so a date after one was read as a label: it answered how long ago, kept no name, and looked like it had worked. That is the worst of the three outcomes, because there is nothing to notice until the name is used. A date written in digits is a value now, and so is an amount with a unit or a currency on it. A named date is still a question: "Deadline: christmas" wants the days, not a variable.

1.231.01 August 2026

Fifty-seven rules had a formula written down and eight of them showed it

30000 a year forever at 4%750,000.00750,000.00, over PV = PMT ÷ i
why 2/10 net 30nothingpassing up the discount to keep the money longer is borrowing, at a rate no bank would quote
explain 30000 a year forever at 4%nothingif you only ever spend the interest the sum is never touched
The working line and the reason behind it went in on five rules and stopped there, which left a documented feature answering for a twelfth of what it claimed. Every money rule carries both now. They are keyed by rule rather than passed at each return, so the formula and its one clause sit together in one table and a reader is a lookup.

1.230.21 August 2026

A half does have a binary spelling

0.5 in binarya base writes whole numbers· the places after a point are halves and quarters, so 0.5 is 0.1 in binary
12 xor 2.5bits belong to whole numbers· there is no bit for a half
round 5 to the nearest 0you cannot round to the nearest nought· the nearest whole number is the one usually meant
Somebody asking for a half in binary has usually met the answer, because the places after the point there are halves and quarters. Hex and base seven get a different note, since the fraction is not the interesting part of those.

1.230.11 August 2026

A pinch is a real amount nobody has ever agreed on

1 pinch in gpinch isn't a unit I know· about 0.36 g, an eighth of a teaspoon
1 mol in gramsmol isn't a unit I know· a mole is a count, not a weight: it needs the substance's molar mass
1 amp in voltsnothing· current is not voltage: the two need a resistance between them
Three different failures were wearing one message. A pinch is a real amount nobody has agreed on, so it gets the figure a kitchen uses and is told the figure is nominal. A mole is a count and a decibel is a ratio, so neither becomes a weight without a fact this page does not hold, and naming the missing fact beats pretending the word was a typo.

1.230.01 August 2026

Three and a half in Roman numerals was answering with this year

3.5 in romanMMXXVIRoman numerals write whole numbers · the nearest is IV, which is 4
0.5 in romanthere's no day 0· the nearest is I, which is 1
Roman numerals write whole numbers, so the rule declined the fraction and the line fell through to a branch that reads a year. "3.5" parsed as a date and came back MMXXVI, which is this year, in a question that never mentioned it. The echo even said so. A wrong answer is worse than a blunt one, and this one was wrong quietly.

1.229.21 August 2026

Eleven more places that were not cities

3pm in atlantisatlantis isn't a place I know· not a real place
The clock reader refused a place eleven ways and none of them said which kind of not-a-place it was. They go through the same note the distance and sun readers use now, so the South Pole reads the same whichever question asked about it.

1.229.11 August 2026

The South Pole is a real place

sunrise at the north polethe north pole isn't a place I know· a real place with no time zone of its own: the sun rises once a year there
sunset in antarcticaantarctica isn't a place I know· name a station, such as McMurdo or Rothera
distance from earth to marsearth isn't a place I know· the planet this is all measured on
"Isn't a place I know" is true of a city that does not exist and misleading about the South Pole. Fourteen names that are real places, continents or planets now say which of the three they are, and Atlantis says it is not a real place rather than sounding like a gap in the table.

1.229.01 August 2026

"Canadian" is not a mistake, it is how the question is said

100 usd in canadiancanadian isn't a currency I have a rate for· try CAD
100 usd in krkr isn't a currency I have a rate for· the krone: DKK in Denmark, NOK in Norway, SEK in Sweden, ISK in Iceland
100 usd in bitcoinbitcoin isn't a currency I have a rate for· the rates here are the ECB's
Nobody says CAD out loud. The names people actually use now point at the code they mean, and the two that several countries share name the choice rather than pick one, since guessing between four rupees would be worse than asking. Bitcoin and gold say why there is no rate rather than pretending the word is a typo.

1.228.11 August 2026

One has no factors but itself, which is why it is not a prime

prime factors of 1factors are counted from 2 up· 1 has none but itself, which is exactly why it is not a prime
factors of 0factors are counted from 2 up· everything divides nought, so the list never ends
correlation 1 2 3 and 4 5those are 3 numbers and 2· drop the odd one out, or add one to the shorter list
Three refusals that were stating a rule without saying why it exists. One having no factors but itself is the entire reason it is not counted as prime, and nought having every number as a factor is the opposite problem.

1.228.01 August 2026

Nought over nought is indeterminate, not infinite

sqrt of -16that doesn't come out to a number· as an imaginary number it is 4i
0/0can't divide by zero· any number at all satisfies it
4000 in romanstops at MMMCMXCIX· past it needs a bar over the numeral
"That doesn't come out to a number" reads like the page has given up, and the square root of minus sixteen has an answer: it is four i. Dividing by nothing and dividing nothing by nothing are two different failures, and the second is the interesting one, since any number at all satisfies it. Ten refusals across the arithmetic now say what is on the other side of them.

1.227.21 August 2026

How many there are is the thing being asked

5th monday of february 2026Feb 2026 has no 5th Monday· there are 4 · the last is 23 Feb 2026
week 53 20272027 has no week 53· its last is week 52 · a year has 53 only when it starts on a Thursday
25/13/202625 and 13 can't be a month and a day· there are 12 months, so neither order reads
A month has four of most weekdays and five of a few, and which it has is the thing somebody typing "5th monday" wants to know. Saying how many there are and naming the last one answers it. The 53rd week gets the rule that decides it, since a year has one only when it starts on a Thursday.

1.227.11 August 2026

Nobody types the 31st of February by accident twice

31 feb 2026Feb 2026 has only 28 days· the last of them is Sat, 28 Feb 2026 · the next 29th is 2028
29 feb 2027Feb 2027 has only 28 days· the next 29th is 2028
0 jan 2026there's no day 0· the month opens on Thu, 1 Jan 2026
An impossible day of a real month is a typo for the last one, or somebody checking whether that month has that day. Either way the useful reply is the date they were reaching for, so it goes under the refusal with its weekday. February gets one line more: "29 feb 2027" is usually somebody asking whether 2027 is a leap year, and saying which year the next one is answers the question actually being asked.

1.227.01 August 2026

A space was the whole of the difference

12 fl oz in mlnothing354.882 ml
1 troy oz in gnothing31.1035 g
1 carat in gcarat isn't a unit I know0.2 g
1 furlong in chainsnothing10 chains
"12 floz in ml" answered and "12 fl oz in ml" said nothing, because the converter reads one word a side and a space was the whole of the difference. The squares have been joined up since they went in; the fluid ounce and the troy ounce now are too. With them, five units that were missing: the carat, exact at a fifth of a gram since 1907, the troy ounce a bar of gold is weighed in, and the surveyor's chain with its furlong, which are why an English field is the shape it is.

1.226.11 August 2026

A rate is an amount only once you say how long

100 sqm in msq m is area, m is length· 10 m a side, if it is square
1 mile in acresmile is length, acres is area· 640 acres if you meant a square 1 mile on each side
50 kwh in kwkwh is energy, kw is power· 2.08333 over a day
60 mph in milesmph is speed, miles is length· 60 miles in an hour
Two more pairs that are questions rather than mistakes. An area against a length is geometry, and a hundred square metres is ten metres a side. A rate against the thing it is a rate of is one fact short, and the missing fact is always how long, so an hour and a day go underneath. Which of the pair arrived first decides whether the hour multiplies or divides, and getting that backwards turns fifty kilowatt-hours into six hundred million kilowatts.

1.226.01 August 2026

Twelve ounces in millilitres is a drink, not a category error

12 oz in mloz is mass, ml is volumeoz is mass, ml is volume · 341.218 ml if it is water
1 cup in gcup is volume, g is mass· 235.878 g if it is water · name a substance and it reads: "1 cup flour in g"
500 ml in ozml is volume, oz is mass· 17.5841 oz if it is water
A refusal that is technically correct and stops dead is half an answer. Mass against volume is the pair anybody actually types, and the page could already do it two ways: as fluid ounces, which is the same word for a different unit, and as a weight of water. Both now sit under the refusal with the number already worked out. Refusals can carry a line underneath them at all now, which is the change the rest of these need.

1.225.01 August 2026

A wrong error is worse than a blunt one

week 54 2026there's no month 54a year has 52 weeks, or 53 in a long one
400th day of 2026there's no month 400the days of a year are numbered 1 to 366
1 amp in voltsvolts isn't a place I knownothing, until the converter can read it
300000 at 6% over 30there's no month 0nothing, until the term names a unit
Eight questions with no date in them were being answered by the date parser, which read the stray number as a month and complained about a calendar nobody had mentioned. Asking for volts returned a geography error. Each reader now keeps the line it recognised instead of letting a later one guess at it.

1.224.01 August 2026

A colon is how a name gets written

andrei: 29nothingandrei = 29, kept
elon: 55nothingelon = 55, kept
Rent: 1200301,895 days agorent = 1200, kept
Price: 6 times 53030
A name could be set with an equals and not with a colon, though a colon is how most people write one down. The colon is also how a label gets written in front of a question, and a label comes off the line before any reader sees it, so "andrei: 29" arrived as "29" and was read as a year. What tells the two apart is what follows: a bare number after a colon is a name for that number, and anything that has to be worked out is still a label on the answer. "Rent: 1200" used to answer 301,895 days ago.

1.223.21 August 2026

The denominator that actual over actual divided by

interest on 10000 at 5% from 1 jan 2024 to 1 jan 2025 on actual/actual366÷actual366÷366
The working line printed the word "actual" where the number it had divided by belonged. For every other convention that slot held a figure, so the one basis that looks at the calendar was the one that would not say what it found there.

1.223.11 August 2026

A grammar nobody can find is a grammar nobody types

the READMEone line about money over timetwelve, covering every rule that went in
Sixty-odd new questions went in behind a single line of documentation reading "what it grows to, costs a month, or takes". The chips file has said since it was written that an undiscoverable grammar is an untyped one, and the same goes for the page that tells you what this reads.

1.223.01 August 2026

A term is a length of time until it is a diary

mortgage on 300000 at 6% over 30 years from 1 sep 2026nothinglast payment 1 Sep 2056
300000 at 6% over 25 years with 10000 off after 5 yearsnothing23 years 8 months
300000 at 6% over 25 years with 10000 offnothing23 years 2 months
A loan with real dates on it ends on a day somebody can look up, and the first payment lands on a working day or it does not land at all, which is the one thing a schedule is actually about. Beside it, a lump thrown at the balance once rather than every month: the same ten thousand saves forty-two thousand paid at the start and thirty-two paid five years in, because what a lump buys is every month of interest the rest of the term would have charged on it.

1.222.01 August 2026

The two halves of this page had never been introduced

interest on 10000 at 5% from 1 jan 2026 to todaynothing279.45
interest on 10000 at 5% since 1 jan 2026nothing279.45
interest on 10000 at 5% from today to christmasnothing210.96
interest on 10000 at 5% from 1 jan 2026 to 1 jan 2027 on 30/360nothing500.00
Every money rule here took an abstract number of years, on a page that has parsed "1 jan 2026", "christmas" and "3 days before easter" since its first week. Every other calculator asks for a number of years because it has no choice. Which day-count is used is said out loud, because it is real money: a lender on actual/360 charges five days a year the calendar does not have, and 30/360 pays no attention to the calendar whatever.

1.221.01 August 2026

The sum, shown, and the reason behind a word

1000 at 5% for 10 years1,628.891,628.89, over FV = PV(1+i)^N · 1,000 × 1.05^10
why 1000 at 5% for 10 yearsnothingeach year's interest joins the sum, so the next year's is worked out on more than the last
explain mortgage on 300000 at 6% for 30 yearsnothingthe one payment that clears the balance in exactly that many goes
Money answers now show their working: the formula in symbols, and the same formula with this question's numbers dropped into it. The symbols alone teach nobody and the numbers alone prove nothing. The reason a formula has the shape it has is a different thing and sits behind a word, because it is an explanation rather than an answer and nobody wants one on the four hundredth keystroke of the day. Every other reader on the page is untouched.

1.220.01 August 2026

A headline and its footnote in two different currencies

mortgage on $300000 at 6% for 30 yearsnothing1,798.65 USD a month
mortgage on ¥30000000 at 6% for 30 years64,751,457.35 under a yen headline179,865 JPY a month
₹300000 at 6% for 30 yearsthere's no month 017,23,047.35 INR
Three things at once. A loan answer never carried a currency, because the money reader wanted a bare number back and a loan hands back "1,798.65 a month". The detail lines were written to two decimals whatever the currency, so a yen headline sat over a footnote with pennies in it. And nine symbols the page had never seen -- the rupee, won, rouble, shekel, dong, naira, baht, hryvnia and peso -- were reaching the date engine and being told about months.

1.219.11 August 2026

Where the shortcut stops being close enough

rule of 114 at 7%nothing16 years 3 months
rule of 144 at 7%nothing20 years 6 months
1000 after 30 years at 3% inflationnothing411.99
72 doubles, 114 triples, 144 quadruples, and only the first of the three read here. They are rules of thumb because they divide easily and land close, and the whole use of an exact figure beside one is knowing where that stops: at seven per cent 72 is right to the month and 144 is a month out. Beside them, what a sum is worth once prices have moved under it, since a figure thirty years out is quoted in money that will not buy what it buys now.

1.219.01 August 2026

Loans that are not the plain shape

300000 at 6% over 25 years with 200 a month extranothing20 years 4 months
30000 car over 4 years at 6% with 12000 balloonnothing482.73 a month
interest only on 300000 at 6%nothing1,500.00 a month
300000 house with 60000 down at 6% over 25 yearsnothing1,546.32 a month
Every extra pound skips all the interest that pound would have owed for the rest of the term, which is why two hundred a month takes nearly five years off and saves sixty thousand. A balloon only pays off the part you use up. Interest-only covers the rent on the money and nothing else, so the debt at the end is the debt at the start, and saying that out loud is most of the answer.

1.218.11 August 2026

The halfway point of a mortgage is nowhere near halfway through it

total interest on 300000 at 6% over 30 yearsnothing347,514.57
balance on 300000 at 6% over 30 years after 5 yearsnothing279,163.07
payment 60 on 300000 at 6% over 30 yearsnothing1,397.82 interest · 400.83 principal
when is half paid off on 300000 at 6% over 30 yearsnothingpayment 252
All of this falls out of the payment and none of it could be asked for. The detail line has carried the total and the interest for as long as the rule has existed, with no way to ask for either on its own. The two worth having are about shape rather than size: five years into a thirty-year mortgage a sixth of the money has gone and a fourteenth of the debt, and half of it is not paid off until payment two hundred and fifty-two.

1.218.01 August 2026

A list of flows, discounted

npv at 10% of -1000 300 300 300 300300 and 300 can't be a month and a day-49.04
irr of -1000 300 300 300 300300 and 300 can't be a month and a day7.714%
payback on 5000 saving 1200 a yearnothing4 years 2 months
Money later is worth less than money now, so every instalment is shrunk by how long you wait for it, and a negative total means the deal loses. The list itself is nothing new here, since this page has read "average of 1 2 3" since the maths went in, and only the weighting is. Payback comes with them and ignores interest entirely, which is why it is the wrong answer and the first one everybody asks for.

1.217.01 August 2026

A pot drawn down is a loan you made to yourself

how long does 500000 last at 2500 a month at 5%nothing35 years 11 months
how long does 500000 last at 2000 a month at 5%nothingforever
30000 a year forever at 4%nothing750,000.00
30000 car depreciating 15% a year for 5 yearsnothing13,311.16
The same arithmetic as clearing a debt, wearing the clothes of a pension, and nobody recognises the one as the other. The refusal is the better half here too: at two thousand a month the pot earns more than it pays out and is never touched. Beside them, the simplest formula in finance, and a car, which loses a share of what it is worth now rather than a share of what it cost, so the first year is the dear one.

1.216.11 August 2026

Two deals, one verdict

5% aer or 4.9% compounded dailynothingthe second
buy 6% down to 5.75% for 3000 on 300000nothing63 months to break even
refinance 250000 from 6% to 5% with 4000 costsnothing156.82 a month
20000 at 6% and 5000 at 19.9%nothing8.78% blended
Four questions that are all really one: is this better than that. Two rates cannot be compared until both are said the same way, and four point nine compounded daily beats a flat five. Paying to buy a rate down only pays if you are still there when the lines cross. And one rate for a whole debt is weighted by what is owed, not the average of the two numbers, which is nearly four points out.

1.216.01 August 2026

What a fee is, once it is written as a rate

1% fee on 7% over 30 yearsnothing24.549% of the pot
25 fee on 100 for 30 daysnothing304.167%
2/10 net 30nothing37.245%
100 in 4 payments of 27nothing291.097% a year
money factor 0.00125 as aprnothing3%
25 basis points on 300000nothing750.00 a year
Six ways of charging for money without quoting a rate, each turned back into one. A one per cent fee over thirty years takes a quarter of the pot, because it is charged every year on a sum that has been growing. Twenty-five pounds for a month is three hundred per cent a year. Passing up a two per cent discount to pay twenty days later is borrowing at thirty-seven. Not "bps" on its own: this page has converted bits per second since the units went in, and that word was there first.

1.215.01 August 2026

The rate you are on, not the rate on the advert

apr on 10000 at 5% over 3 years with 500 feenothing8.459%
apr on 10000 with 500 fees at 5% over 3 yearsnothing8.459%
apr on 10000 at 5% over 3 yearsnothing5%
The only rule here that works out what the letters APR stand for. Everything on this page that has ever been called an APR was a nominal rate, which is the number on the advert. The real one balances what you pay against what you received, and you did not receive the fee: charged on ten thousand with nine and a half arriving turns five per cent into eight and a half.

1.214.11 August 2026

Not the multiplication, and not the subtraction

2% a month as a yearnothing26.824% a year
19.9% a year as a monthnothing1.524% a month
5% at 3% inflationnothing1.942% real
5% after 20% taxnothing4% net
Three rates that everybody works out with the wrong operation. Two per cent a month is not twenty-four a year, because month two is charged on month one's interest. Five per cent at three per cent inflation is not two, because the three lands on the five as well as on the sum. Tax really is the subtraction, since it lands on the interest and not on the sum, and that is why it is worth saying which of the three you are looking at.

1.214.01 August 2026

Twelve slices of a twelfth do not make a whole

5% apr compounded monthly as aernothing5.116%
5.116% aer as a monthly aprnothing5%
19.9% apr compounded daily as aernothing22.012%
5% compounded continuouslynothing5.127% effective
A nominal rate and an effective one are the same money described twice, and two deals cannot be compared until both are said the same way. That is why AER is a legal requirement on a savings advert and APR is one on a loan, and neither could be worked out here. Each slice earns for the rest of the year, which is the whole of the difference.

1.213.01 August 2026

The first thing anybody is taught was the one thing missing

simple interest on 1000 at 5% for 3 yearsnothing150.00
simple or compound on 1000 at 5% for 3 yearsnothing150.00 simple · 157.63 compound
daily interest on 300000 at 6%nothing49.32 a day
Simple interest is worked out on what you started with, the same every year, so it never earns on itself. Short-term loans, most bonds and court judgments are all written that way, and it is the only honest thing to show compound interest against: the two side by side are the whole of the idea in two numbers. A day of it is here too, which is the figure a completion date is worth, and it says which length of year it used, because a lender using 360 days charges five days the calendar does not have.

1.212.11 August 2026

A pension is never paid in a flat payment

200 a month rising 3% a year at 5% for 10 yearsnothing35,172.99
A pension contribution is a share of a salary and a salary moves, so a flat payment is the one shape it is never actually paid in. Four thousand more than the same habit standing still, and the detail line says what the last payment had grown to.

1.212.01 August 2026

Nobody has only a lump or only a habit

10000 plus 200 a month at 5% for 10 yearsnothing47,526.55
50000 plus 500 a month at 6% for 20 yearsnothing396,530.67
A sum already put by and something going in every month, which is what anybody actually has. The two never interfere: the lump grows on its own and the payments accumulate on their own, so the answer is the two added, and the detail line says which half did which.

1.211.21 August 2026

The return that would have to turn up

what return gets 200 a month to 100000 in 10 yearsnothing24.357% a year
what return gets 1000 a month to 100000 in 10 yearsnothingthe payments alone already pass that
The same search run on a habit rather than a debt, and it is worth answering mostly so the size of the number talks somebody out of the plan: two hundred a month reaching a hundred thousand in ten years needs a return nobody is going to get.

1.211.11 August 2026

The rate there is no rearranging for

what rate is 20000 over 5 years at 400 a monthnothing7.42%
what rate is 20000 over 5 years at 100 a monthnothingthat pays back less than it borrows
Every other term in these formulas comes out with algebra and the rate does not, because it sits inside a power and inside a division by itself. So it is found the way a lender finds it, by halving the gap until the payment matches. The effective rate goes underneath, since the two are what a deal is compared on.

1.211.01 August 2026

Doubling over ten years is seven per cent, not ten

what rate turns 1000 into 2000 in 10 yearsnothing7.177% a year
cagr from 1000 to 2000 over 10 yearsnothing7.177% a year
how long for 1000 to reach 2000 at 5%nothing14 years 2 months
how long to halve at 3%nothing22 years 9 months
triple time at 7%nothing16 years 3 months
The one steady rate that would have got there, which is not the total growth divided by the years. Its twin reads the same sum for the time instead, and that turns out to be one rule wearing four hats: doubling, tripling, quadrupling and halving are all the same logarithm, and losing three per cent a year is the same sum with the sign turned round.

1.210.21 August 2026

What a sum you get later is worth now

present value of 2000 in 10 years at 5%nothing1,227.83
what do i need now to have 2000 in 10 years at 5%nothing1,227.83
Growth read backwards. Every price with a delay in it is this question, and it is the half of compounding nobody is taught: two thousand promised in ten years is twelve hundred today, and the rest of it is the waiting.

1.210.11 August 2026

Nobody wonders what two hundred a month comes to

how much a month to have 100000 in 10 years at 5%nothing643.99 a month
how long to save 100000 at 200 a month at 5%nothing22 years 7 months
They know what they need and want to be told the two hundred. The same habit read for the payment, and read for the term, which are the two ends anybody actually holds.

1.210.01 August 2026

Nobody has only a lump

200 a month at 5% for 10 yearsnothing31,056.46
500 a month at 6% for 20 yearsnothing231,020.45
A sum left alone has grown here since the first week and a habit never had. Each payment has less time left to earn than the one before it, so the first earns for the whole term and the last earns nothing, which is why the answer is not the total multiplied by anything.

1.209.11 August 2026

The direction a mortgage is really shopped in

how much can i borrow at 6% over 30 years at 1500 a monthnothing250,187.42
how much can i afford at 5% over 25 years paying 1200 a monthnothing205,272.06
The payment you can stand is the number you know. The principal is the one you are trying to find out, and it is the same formula as the monthly payment with a different term missing.

1.209.01 August 2026

The payment that never clears it

how long to pay off 3000 at 19.9% paying 100 a monthnothing3 years 6 months
how long to pay off 3000 at 19.9% paying 49 a monthnothingnever
This could work out a payment and could not be told one, so every question where the payment is the number you already know was out of reach. The answer worth having is the second one: below a payment that covers the month's interest nothing comes off the debt at all, and "never" is the credit-card minimum laid bare.

1.208.31 August 2026

Two per cent a month is not two per cent

1000 at 2% a month for 3 yearsnothing2,039.89
doubling time at 2% a monthnothing2 years 11 months
1000 at 1% a week for 1 yearnothing1,677.69
Two per cent a month is twenty-six and a half over a year, because month two is charged on month one's interest as well. Only a yearly rate read here, so the rate that most needs working out was the one shape this could not be asked about.

1.208.21 August 2026

Thirty-six months is how a car loan is written

loan on 20000 at 5% for 36 monthsnothing599.42 a month
loan on 25000 at 7% for 24 monothing1,119.31 a month
loan on 20000 at 5% for 60 paymentsnothing377.42 a month
A term only read in years. A car is sold over thirty-six months and a phone over twenty-four, and nobody selling either writes it as a number of years, so the two commonest consumer loans in the world had to be divided by twelve in your head first. Weeks and a bare count of payments read now too.

1.208.11 August 2026

The word every rate is quoted with

20000 at 5% apr over 5 yearsnothing25,525.63
mortgage on 300000 at 6% apr for 30 yearsnothing1,798.65 a month
1000 at 5% p.a. for 10 yearsnothing1,628.89
Every loan agreement in the language says "5% APR" and every savings account says "5% AER". Neither word read, so the one sentence somebody copies straight off their own paperwork was the shape that answered nothing. "p.a.", "per annum", "a year" and "interest" come with them.

1.208.01 August 2026

A rate question is not a date

20000 at 5% apr over 5 yearsthere's no month 0nothing, until it can be read
apr on 10000 with 500 fees at 5% over 3 yearsyear must be between 1 and 9999nothing, until it can be read
A line with a percent sign next to a term was falling past the money reader and landing on the date engine, which read the numbers as a day and a month and complained about a calendar nobody had mentioned. That is worse than silence twice over: it is wrong, and it sends whoever typed it looking for the mistake in the wrong half of their line.

1.207.91 August 2026

Three quarters of a hundred

three quarters of 100nothing75
two thirds of 90nothing60
The singular has read since the spoken fractions went in, and the plural is the commoner half of the pair: nobody says "a quarter" as often as they say "three quarters".

1.207.81 August 2026

How long until five

how long until 5pmnothingin 21 hours
The unit had to be named -- "hours until 5pm" -- and the question is asked without one at least as often, when the answer is wanted in whatever it comes out as.

1.207.71 August 2026

The README catches up again

The README catches up with the fifty-odd releases behind it: the flights, the bearings, the golden hour, the solstices and the seasons, the screen units, the gas mark, the speeds, the odds, the due date, the names for things, and every phrasing of a question that used to be silent.
It is the description a reader trusts before they type anything, so a description of a calculator that no longer exists is worse than none.

1.207.61 August 2026

The chips catch up with the grammar behind them

The chips are the only thing on the page that says what it can be asked, and eight kinds of question had gone in behind them without one: the golden hour, the solstices, the seasons, whether it is dark, how long until sunset, which way one place is from another, and a flight asked in two words rather than in seven.
A visitor is shown twelve of these and leaves believing that is the whole of it, which is the argument for keeping them in step.

1.207.51 August 2026

The unit said in the middle of the question

how tall in feet and inches is 180 cmnothing5 feet 10.8661 inches
how far in miles is 20 kmnothing12.4274 miles
The unit wanted, said in the middle of the question, which is where it goes when the question is about the thing rather than about the number.

1.207.41 August 2026

A percentage of a percentage of something

30% of 30% of 100nothing9
10% of 50% of 200nothing10
How a share of a share of a price is quoted, and how a discount on a discount is worked out. One "of" has read since the first week; the chain is the same rule applied to whatever is left.

1.207.31 August 2026

Add up a list

add up 10 20 30nothing60
The list reader's question said as an instruction. The two words in front of it are the whole of the difference, and they were enough to silence it.

1.207.21 August 2026

The and in a short list

average of 10 and 20nothing15
sum of 10 and 20nothing30
The word between two numbers is how a short list is said, and the list reader read digits, commas and spaces. Two numbers is where "and" gets typed and three is where it stops, so the shortest list was the one that could not be written out loud.
Only between two numbers, which leaves "gcd of 12 and 18" -- a pair function, read two readers earlier -- exactly as it was.

1.207.11 August 2026

The thing the day belongs to

days until my birthday on 15 junnothingin 326 days
how many days until the exam on 1 decnothingin 130 days
The noun and its possessive carry no part of the answer -- the date behind the "on" is the whole of it -- and they were enough to silence the line.
Not the words the date grammar owns: "a fortnight on tuesday" and "the last friday of may" are dates read whole, and a rule that swallowed those would take a date away rather than a label.

1.207.01 August 2026

A countdown to a day that has been

days until 15 jun39 days agoin 326 days · Tue, 15 Jun 2027
days since 15 junnothing39 days ago
A day and a month with no year is this year's, which is right for "15 jun" on its own and wrong for a countdown: half the year is behind us, and a countdown to a day that has been is a countdown to nothing.
The same rule the holidays have always followed -- bare "christmas" is the next one -- said for a date written in numbers, and only where the word "until" is there to say it.

1.206.01 August 2026

Next quarter, and next june

next quarternothingin 69 days · Thu, 1 Oct 2026
next junenothingin 312 days · Jun 2027
The month and the year could be counted forwards and back and the quarter could not, though it is the period a plan is written in as often as either.
"next june" is how a date a long way off gets written, and the bare month has always answered with this year's -- which half the time has been and gone.

1.205.01 August 2026

Gas mark 6

gas mark 6nothing204 °C · 400 °F
180 c in gas marknothinggas mark 4 · the nearest mark; 6 °F off
A recipe printed in Britain says gas mark 6 and an oven anywhere else has degrees on it, so this is a conversion in the plainest sense and one this file could not do.
The marks are a defined ladder: mark 1 is 275 °F and every mark after it is 25 °F more, with two half-marks below. Going the other way it says which mark is nearest and how far off, because an oven dial has no notches in between.

1.204.01 August 2026

Feet and inches are one answer, not two

180 cm in feet and inches5.90551 feet and 70.8661 inches5 feet 10.8661 inches
70 kg in stone and poundsnothing11 stones 0.323584 pounds
150 minutes in hours and minutesnothing2 hours 30 minutes
"in feet and inches" is one answer written in two units, and it was being answered twice over: 5.9 feet and 70.9 inches are the same height said again, which is arithmetic nobody asked for.
Only the pairs that are spoken as a pair, which this file already lists for reading them on the way in. Two units that are not a pair -- miles and feet, Fahrenheit and kelvin -- are still two answers.

1.203.01 August 2026

The due date, and how far along

due date if last period 1 jun 2026nothingMon, 8 Mar 2027
how many weeks pregnant am i if due 1 mar 2027nothing8 weeks 4 days
Two of the commonest date questions there are, and both are arithmetic this file already did: 280 days from the first day of the last period, and the forty weeks minus what is left of them.
Naegele's rule is a convention rather than a measurement -- it assumes a 28-day cycle -- and the answer says so, because a date that decides plans should not look measured.

1.202.01 August 2026

One in fourteen million

1 in 14 millionthere's no month 140000000.00000714285714286% · 1 in 14,000,000
1 in 6nothing16.6666666667%
Odds written the way odds are written. It is a percentage question wearing the other notation, and the point of asking is that the two are hard to hold in your head at once.
The date engine got to it first and reported a month nobody typed. An inch is still an inch: "1 in cm" has a unit after it and not a count.

1.201.11 August 2026

How long you have been alive

how many seconds have i been alive if born 15 jun 1990nothing1,139,443,200 seconds old
The same question with the same answer, asked as time lived rather than as an age, which is how it is put when the number is going to be a surprise.

1.201.01 August 2026

Six from forty-nine

how many combinations of 6 from 49nothing13,983,816
how many permutations of 3 from 10nothing720
The lottery question, which is the one everybody has and the one shape of it this file could not read: the two numbers are said in the other order, with the word for what is wanted in front. Nobody writes "49 choose 6" outside a textbook.

1.200.11 August 2026

A percentage of a percentage

5% of 20%nothing1%
A share of a share is how a stake, a commission and a swing in a poll are all quoted, and the whole had to be a plain number.

1.200.01 August 2026

Nine to five

9 to 5 in hourshours isn't a place I know8 hours
how many hours from 9 to 5nothing8 hours
A bare hour is read as one only where the line has already said so, by naming the unit at either end. "3 to 5" is a range of two numbers in every other grammar here and stays one.
"9 to 5" is an afternoon rather than a night: two bare hours on a twelve-hour clock with the second one smaller are the two ends of a working day, which is the only reason anybody writes them that way.
It is also not nine minutes to five. Digits are read as minutes only in front of "past", where there is nothing else the line could be.

1.199.21 August 2026

A day on the end of a clock question

time in tokyo tomorrownothing9:00 am in Tokyo
The clock reader has always held that a day changes nothing about what time it is now, and it was still refusing the line for having one. The place is taken and the day is dropped, which is the same answer said without the argument.

1.199.11 August 2026

Words in the middle of a clock question

what is the time difference in hours between tokyo and londonin hours between tokyo isn't a place I knowLondon is 8 hours behind Tokyo
what will the time be in tokyobe isn't a place I know9:00 am in Tokyo
Two words in the middle of a question, each carrying nothing and each being read as the start of a place name. The unit the answer is wanted in is already the unit it is given in.

1.199.01 August 2026

A length of time, said the other way

90 minutesnothing1 hour 30 minutes · 1.5 hours · 5,400 seconds
0.5 hoursnothing30 minutes
5000 secondsnothing1 hour 23 minutes 20 seconds
A bare quantity has answered since the converter learned that what somebody typing "5 miles" wants is the other system. An hour, a minute and a second had no other system, so the three lengths this page converts in every direction were the three it could not simply show.
Said the way a stopwatch says it, and only where that is different: "5 minutes" says itself already, and handing it back would be answering the question with the question.

1.198.01 August 2026

A stopwatch reading with a colon in it

2:30 in minutesminutes isn't a place I know150 minutes
2:30 to secondsnothing9,000 seconds
The converter has read "2h30 in minutes" since the compound units went in, and a colon is how the same thing is written by anything that times something: a video, a run, a recording.
Only in front of a length of time, which is what keeps every clock query on the page a clock query: "3:30 in london" has a place after it and means an hour of the day.

1.197.11 August 2026

How far is the moon

how far is the moonnothing384,400 kilometers
how far is the sunnothing149,597,870.7 kilometers
Asked as a question rather than as a noun, which the distance reader takes for a place it does not know and then says nothing about.

1.197.01 August 2026

Boiling, freezing, and how far the two lights are

boiling point of waternothing100 Celsius · at one atmosphere
distance to the moonnothing384,400 kilometers · the mean; it runs from 356,500 to 406,700 km
distance to the sun in milesnothing92,955,807 miles
Four things asked about far oftener than the Boltzmann constant, and none of them were here.
Both temperatures are conventions rather than measurements and say so: water boils at 100 °C at one atmosphere and at 93 °C on a mountain, and the freezing point is the zero of the scale by construction.
The sun's distance is a definition, the astronomical unit having been fixed in 2012; the moon's is a mean of something that moves between 356,500 and 406,700 km, which is a difference worth saying.

1.196.11 August 2026

The day in front of the clock

monday 9am in tokyonothing10:00 pm in Tokyo · Mon 27 Jul
tuesday at 3pm in londonnothing8:00 pm in London
That is the order a meeting is written in, and it was the one order the clock reader could not take. Moved behind the clock, where a day has been read since "3pm tomorrow in tokyo" went in, rather than teaching the same thing twice.

1.196.01 August 2026

A day said before the place

3pm tomorrow in tokyotomorrow isn't a place I know4:00 am in Tokyo · Sat 25 Jul
9am monday in tokyomonday isn't a place I know10:00 pm in Tokyo · Mon 27 Jul
That is how a meeting gets written down, and the day may be said on either side of the clock. Read from the far side it has always worked; read from this side the day was handed to the place resolver and blamed for not being a city.

1.195.01 August 2026

A mile, with no one in front of it

a mile in kmnothing1.60934 km
a fortnight in daysnothing14 days
"1 mile in km" answered and "a mile in km" did not, though nobody says the one out loud. The article counts as the amount on the left and never on the right, where it means the opposite: "seconds in a day" is a count of seconds.
The date grammar has counted in fortnights since the offsets went in, and the converter had never heard of one.

1.194.01 August 2026

The ordinal spelled out

1st in wordswords isn't a unit I knowfirst
21st in wordsnothingtwenty-first
The date grammar owns "1st" and reads it as a day of this month, so the line came back with an error about a unit nobody typed, for a question with nothing wrong in it.
It is the same number said with a different ending, and the endings are a short list: first, second, third, fifth, eighth, ninth, twelfth, and -y becoming -ieth.

1.193.71 August 2026

A number in words, asked politely

what is 1234 in wordsnothingone thousand two hundred and thirty-four
how do you say 1234nothingone thousand two hundred and thirty-four
This reader runs before the rewrites, for a good reason -- a question about how a number is written must be read before anything rewrites how it is written -- and so it never had the politeness taken off for it.

1.193.61 August 2026

Holidays, listed rather than asked for

list holidays in francenothing11 national holidays
"list of holidays" read and "list holidays" did not, which is the same line written as an instruction rather than as a phrase.

1.193.51 August 2026

A bill said before the splitting

120 split 4 waysnothing30.00 each
$120 split 4 waysnothing30.00 USD each
The bill may be said before the verb, which is the order it comes in when the bill is the thing being talked about, and it was the shape the splitter could not read.
A split with a currency on it comes back in that currency, the money reader having learned the one word the splitter puts after a number.

1.193.41 August 2026

The words people put round a rate

what is 100 eur worth in usdeur worth isn't a currency I have a rate for108.70 USD
exchange rate eur usdnothing1.09 USD
The verb in the middle was being read as the second word of the currency's name, which blames the reader for a word that carries nothing.
The noun in front with no amount at all means one of the first: a rate is what one of a thing costs in another.

1.193.31 August 2026

The day number, with the year left unsaid

what day number is todaynothingDay 205 of 365
The count with the period left unsaid, which is the year: that is the only period a day is numbered in, and it is how the question gets typed by anybody who has seen the number on a form.

1.193.21 August 2026

The next friday the thirteenth

next friday the 13thnothingin 112 days · Fri, 13 Nov 2026
The bare name already means the next one, and the word in front of it was being read as "next friday" with an ordinal left over behind it, which answers nothing at all.

1.193.11 August 2026

A clock question asked politely

what is 3 hours before 5pmnothing2:00 pm
what is 3pm in tokyonothing4:00 am in Tokyo
The same line with the politeness in front of it, which the clock reader had no entry for. Only in front of a digit, since "what time is it" is a question it owns whole.

1.193.01 August 2026

The next working day

next working daynothingMon, 27 Jul 2026
previous working daynothingThu, 23 Jul 2026
The offset engine has counted business days since the holidays went in, and the plainest question about one had no spelling. It is what gets asked on a Friday afternoon.
The whole line only, or "last working day of may 2026" would lose the month it is about: that is a different question and it already had an answer.

1.192.21 August 2026

The year 2026 is the same period as 2026

how many days in the year 2026nothing365 days
how many days in the month of julynothing31 days
The noun in front of the period names what the period is, which the period already says. It was the one word in the question with nothing in it, and it stopped the whole line.

1.192.11 August 2026

The first day of summer

first day of summernothingMon, 21 Jun 2027 · 10:12 am
The solstice named as a day, which is how a diary asks for it rather than how an almanac does. The months keep their own first days.

1.192.01 August 2026

The clock said in words

half past three in tokyonothing4:30 pm in Tokyo
quarter to four in tokyonothing4:45 pm in Tokyo
twenty to six in tokyonothing6:40 pm in Tokyo
This is how a time is spoken by most of the people who speak one, and the clock reader had only ever read digits.
Turned into digits once, before anything reads the line, so the conversion, the span and the sun all get it rather than each growing a spoken twin.
Only the phrases that cannot mean anything else. "3 to 5" stays a range of two numbers, which is what it is in every other grammar on this page.

1.191.21 August 2026

Ten per cent more than fifty

10% more than 50nothing55 · 5 more than 50
10% less than 50nothing45
How a rise is quoted before it has happened: a rent, a fare, an offer. The reader beside it has always read "150 is what percent more than 120", which is the same words with the numbers the other way round.

1.191.11 August 2026

The letter people multiply with

3 x 12.50nothing37.5
12 × 12nothing144
That is how a price is written on the back of an envelope, and the times sign is what a keyboard with one produces.
Not the x of a hex prefix, which is a nought with an x behind it, and not the x of an equation, which has no digit in front of it: "0xff + 0x01" and "2x + 3 = 7" both go on meaning what they meant.

1.191.01 August 2026

The year of birth, from an age

what year was i born if i am 36nothing1989 or 1990 · 1990 if the birthday has been this year
The age question asked backwards, which is how it arrives when somebody is filling in a form from a number they were told.
Two years, and saying so is the whole of the answer: one of them would be wrong for half the year without ever looking wrong.

1.190.01 August 2026

The fortieth birthday, and how long until it

how many days until my 40th birthday if born 15 jun 1990nothingin 1,422 days
40th birthday if born 15 jun 1990Jul 2026 has only 31 daysSat, 15 Jun 2030
"when will i turn 40" answered and the same day named as a birthday did not, though that is what it gets called. The ordinal was read as a day of this month, which produced an error about a number nobody typed.
Nearly always asked as a countdown, and in whatever unit the question used: nobody wants the date of the fortieth so much as how long there is until it.

1.189.11 August 2026

Which year a date is in

what year was 30 years agonothing1996
what year will it be in 10 yearsnothing2036
what year is christmasnothing2026
The week, the quarter and the month could all be asked about any date and the year could only be asked about today, though it is asked the same way and about the same dates.

1.189.01 August 2026

A fraction in its lowest terms

simplify 6/8nothing3/4 · both divided by 2
reduce 100/250nothing2/5
Turning a decimal into a fraction has answered since the notations went in, which is the harder half of the same job, and a fraction already written down could not be reduced.
The answer says what it divided by, which is the part anybody doing it by hand wants to check. A bare "6/8" is still a division and still answers 0.75.

1.188.01 August 2026

Whether the sun is up

is it dark in tokyonothingno, the sun is up in Tokyo · sets at 6:53 pm
is the sun up in tokyonothingyes, the sun is up in Tokyo
This is what the sun times get looked up for in the first place: whether to take a torch, whether the light has gone, whether it is worth ringing somebody.
Two lookups this file already does, never put together. The answer says which it is whichever way round the question was put, so a no is never only a refusal.

1.187.01 August 2026

A speed, from a distance and how long it took

20 miles / 2 h to km/hnothing16.0934 km/h
20 miles in 2 hoursnothing10 mph
5 km per 30 minnothing10 km/h
1 mach in mphnothing761.207 mph
The converter has held speeds since the units went in and could only ever be given one. Somebody with a distance and a time had to divide them in their head first, in units that agree, which is exactly the arithmetic they came here for.
Both halves go through the tables, so every length and every time this file knows can be either one, and the answer is written in what the question was asked in: a distance in miles comes back in miles an hour.

1.186.01 August 2026

Weekends, counted

how many weekends until christmasnothingin 22 weekends
how many weekends in 2026nothing52 weekends
Every weekday could be counted and the weekend could not, which is the one anybody plans in. It is counted by its Saturday, there being one of each between any two dates.

1.185.21 August 2026

Rounding, said the way it is said

3.7 rounded downnothing3
round 3.7 to 1 decimalnothing3.7
The noun is left off as often as it is said: "to 1 decimal" was the one spelling this could not read.
The past tense with no count at all is the commonest rounding there is, and it was the shape with no verb in front and no places behind.

1.185.11 August 2026

A calendar asked for in a sentence

what is the islamic datenothingSafar 10, 1448 AH
what is the hebrew datenothing10 Av 5786
"hijri date" answered and the same question in a sentence did not, the words in front being read as part of the name of a calendar nobody has.

1.185.01 August 2026

Every calendar at once

today in all calendarsnothingHebrew, Islamic, Persian, Buddhist, Indian, Japanese, Minguo, Coptic and Ethiopian at once
One at a time has answered since the calendars went in, and the question underneath is which of them a date lands differently in: a birthday, a feast, a form that wants the Hijri year.
It costs nothing new. The runtime formats them all and the list was already here.

1.184.21 August 2026

Week number, with no question round it

week number todaynothingWeek 30 of 2026
week numbernothingWeek 30 of 2026
Somebody who wants the number rather than a sentence types the noun and nothing else. The bare noun on its own is still left alone, because "week 30" names one rather than asking for it.

1.184.11 August 2026

A holiday with a word in front of it

how many days between christmas and new yearnothing7 days
days between christmas and easternothing93 days
A name was read at the position the run starts at, and the filler in front of it was skipped only by a loop that never reaches a name. "christmas to new year" answered; the same question with the word "between" in front of it did not.

1.184.01 August 2026

Which season it is

what season is itnothingsummer · since 21 Jun 2026 · until 22 Sep 2026
when does winter startnothingMon, 21 Dec 2026 · 3:54 pm
The solstices and the equinoxes are the four boundaries, so this is the same arithmetic asked from inside the year rather than about a date in it.
The astronomical reckoning, and the answer says so: a meteorological summer starts on the 1st of June and is a convention of the forecasters rather than a fact about the sun.
The names are the reader's own hemisphere's, as the solstice names are.

1.183.01 August 2026

The answer before this one

$6 times 5, then: ans - 9%nothing27.30 USD
2+2, then: ans * 10nothing40
The one name nobody has to be told about, and the second half of nearly every session: a price, then the price with the tax on it; a distance, then the distance in miles.
It holds the text of the answer rather than its value, so the currency comes with it and "ans - 9%" is a discount on the money rather than on a bare number.
Only where the headline is a number. "Friday" is an answer and it is not one you can multiply by three, so the name goes on holding the last one that was.

1.182.01 August 2026

Arithmetic on an amount of money

$6 times 5nothing30.00 USD
$100 - 9%nothing91.00 USD
20% of $50nothing10.00 USD
The sums have been here since the first week and the currencies since the rates went in, and the two had never met: a line with a currency in it was a conversion or it was nothing, so multiplying a price by five came back silent.
The currency comes off, the sum is handed to the arithmetic exactly as it would have been without it, and the answer is written back in the currency it was asked in. Every rule the maths already has applies to money for nothing.
One currency only. "5 usd + 3 eur" is a sum with a rate hidden inside it, and quietly picking one would bury today's date in an answer that does not look like it has one.

1.181.01 August 2026

Integer division, and the other separator

5 \ 2169 days ago2
gcd(63; 27)nothing9
"mod" is the remainder and has been answerable since the sums went in. The whole part of the same division had no spelling at all, and the backslash a calculator writes it with was being read as a date, which is worse than a silence.
The semicolon is how the other half of the world separates arguments, the comma being their decimal point.

1.180.11 August 2026

A conversion asked from the other end

20 km equals how many milesnothing12.4274 miles
how tall is 6 feet in cmnothing182.88 cm
The question can sit at the far end, which is how it is written by somebody who starts from the quantity they have rather than from the unit they want.
A length is tall, long, wide, deep or far and a mass is heavy. None of those words carry any part of the answer, and every one of them silenced the line.

1.180.01 August 2026

The volumes are the lengths cubed

1 m3 in litresnothing1,000 litres
1 cubic foot in litresnothing28.3168 litres
5 dm3 to lnothing5 l
The areas here have been the lengths squared since the units went in, and the volumes were not the lengths cubed. Now they are: every length gets a cubic twin for four lines, and a cubic foot cannot drift from the foot it is made of.
Three spellings, because a keyboard makes the digit easy: "cubic metre", "m3" and "m^3" are one unit. The digit has to be welded to the unit, or "in 3 weeks" would be a cubic inch.

1.179.01 August 2026

A country this file knows and cannot answer for

time in the usnothingthe US keeps 7 clocks, from Honolulu to Detroit: name a city
sunrise in australianothingAustralia keeps 5 clocks, from Perth to Lord Howe: name a city
A silence reads as "never heard of it", which is the one thing it does not mean. The United States is a place this file knows perfectly well and cannot answer for, because the answer depends on which side of it you mean.
The two ends get named rather than a favourite three, because which cities are worth naming should not be a matter of taste, and the extremes say how wide the country is.

1.178.01 August 2026

A country, where the country keeps one clock

time in japannothing9:00 am in Japan
time in the uknothing1:00 am in the UK
sunrise in japanjapan isn't a place I know4:43 am in Tokyo
The zone table is a table of cities and a country is not one, so "time in japan" was not a question here at all while "time in tokyo" was.
Only where the country keeps one clock. The United States keeps six and Australia five, and answering one of them for the country would be wrong five times in six with nothing on the page to say so, so those stay quiet.
Two letters are a word before they are a country: "gb" is a gigabyte, "it" and "at" and "no" are English. The spelled-out names have no second reading and need no such guard.

1.177.11 August 2026

Is tokyo in dst

is tokyo in dstnothingno · Tokyo doesn't change its clocks
is london on summer timenothingyes · clocks go back 25 Oct 2026
The place could only be said behind the word: "is it dst in tokyo" answered and "is tokyo in dst" did not, which is the order it is asked in about somewhere that is not here.

1.177.01 August 2026

The weekend, and the ends of a month you did not mean this one

how long until the weekendnothingin 1 day · Sat, 25 Jul 2026
end of this monthnothingFri, 31 Jul 2026
start of next weeknothingMon, 27 Jul 2026
"this weekend" answered and "the weekend" did not, which is the spelling everybody uses. Filler is skipped between the words of a date and not in front of the first one, so the article was still sitting on it.
The end and the start now take which period as well as which end: this month, next month, last month, next week. The words in the middle were filler to nobody.
A week runs Monday to Sunday here, the way it is numbered everywhere else in this file.

1.176.01 August 2026

How far through the year we are

how far through the year are wenothing55.9% through 2026 · 205 days in, 161 days left
how far through the month are wenothing74.2% through July 2026
how far through the day are wenothing83.3% · 4 hours left
Every part of this has been on the page since the periods went in: the day of the year on the detail line of "what is the date", the week number on nearly every answer. What could not be asked was the question that puts them together as a fraction.
It is asked in December about a year and on a Wednesday about a week, and it is the same arithmetic both times: where today falls between two boundaries.

1.175.01 August 2026

Sleeps, and a countdown

how many sleeps until christmasnothingin 154 days
christmas countdownnothingin 154 days · Fri, 25 Dec 2026
A sleep is a day counted by whoever is waiting for it, which is who asks. Plural only, like the weekdays, because "sleep" is a word with another life.
"christmas countdown" is a whole question in two words, and it names the thing being counted to rather than the counting.

1.174.01 August 2026

An age in days, weeks or months

how many days old am i if born 15 jun 1990nothing13,188 days old
how old is someone born 15 jun 1990 in monthsnothing433 months old · and 9 days
A thousandth day and a six-month-old are the same subtraction this reader already does, quoted in a different unit, and there was no way to name one.
Months are counted the way a calendar counts them, a month not being a fixed number of days, and the days left over are said rather than dropped.

1.173.01 August 2026

The question said after the birth date

if i was born in 1990 how old am inothing36 years 6 months 23 days
born 15 jun 1990 how old am inothing36 years 1 month 9 days
how old would i be if born in 1990nothing36 years 6 months 23 days
The birth date had to end the line, and half the time it does not: "if i was born in 1990 how old am i" is the sentence said in the order it is thought in, the date first and the question after it.

1.172.01 August 2026

Date arithmetic told rather than written

add 3 months to 15 jan 2026nothingWed, 15 Apr 2026
subtract 2 weeks from christmasnothingFri, 11 Dec 2026
what was the date 6 months agonothingSat, 24 Jan 2026
The engine has read "15 jan 2026 + 3 months" since the offsets went in. This is the same sum with the halves in the order somebody says them when they are telling a calculator what to do.

1.171.01 August 2026

A tip with no rate said

tip on 47.50nothing7.13 · 8.55 · 9.50 · totals 54.63 · 56.05 · 57.00
split the bill 120 by 3nothing40.00 each
That is how it gets typed by whoever is holding the slip, and it names no rate. There is no right rate to assume and this does not pretend there is: it answers at fifteen, eighteen and twenty per cent, with the totals underneath.
Three numbers on a line is the whole reason to ask a calculator rather than to divide by five in your head. Say a rate and it goes back to answering one.

1.170.31 August 2026

Roman numerals, with the name said first

roman numerals for 2026nothingMMXXVI
roman numeral 2026nothingMMXXVI
"2026 in roman numerals" answered and the name said first did not, which is the order every other give-me-X-of-Y question on this page can be asked in.

1.170.21 August 2026

Hex digits say what they are

ff in decimalnothing255 · ff base 16 in base 10
beef in decimalnothing48879
A prefix says what base a number is written in, and nobody types one: "ff in decimal" says it by the letters it is made of, since base ten has no f in it.
The echo says the reading out loud rather than assuming it silently, and a target of hex is left alone, because "ff in hex" would be answering the question with the question.

1.170.11 August 2026

Two to the tenth

2 to the 10thnothing1,024
e to the 2nothing7.38905609893
"to the power of" has been read since the spoken signs went in, and nobody says the word "power" out loud. The ordinal is what marks a number rather than a noun, so "to the moon" is still nobody's sum.

1.170.01 August 2026

The fractions people say instead of writing

half of 60nothing30
a third of 90nothing30
3/4 of 200nothing150
double 42nothing84
"half of 60" is the commonest sum there is out loud, and the one shape of it this file could not read: it has read "60 / 2" since the first week and "half" is the word for the same thing.
The periods keep their words. A quarter of a year is still a quarter of a year, because these are read only where a number follows.

1.169.01 August 2026

The whole, asked for instead of the part

20% of what is 30nothing150 · 20% of 150 is 30
20% of what is 30 cmnothing150 cm
5 is 10% of whatnothing50
Five orders of the percentage question were readable and this was the sixth: every other rule takes the whole and hands back a part, and this is the one where the part is the number you have.
A unit rides along on the part, because the answer is in whatever the part was in. Dropping the "cm" would hand back a number that has lost what it counts.

1.168.01 August 2026

Told what to do rather than what happened

increase 200 by 15%nothing230
take 20% off 200nothing160
add 20% to 200nothing240
"200 increased by 15%" has answered since the spoken signs went in, and that is the sentence somebody writes about a number that has already moved. The imperative is what they type when they are telling the calculator what to do.
Both orders of the two halves are one sum, so "add 20% to 200" and "take 20% off 200" arrive at the rules that were already there.

1.167.01 August 2026

Which way it is

bearing from tokyo to londonnothing336° NNW · arriving 212° SSW
which way is london from tokyonothing336° NNW
It has been printed on the detail line of every distance answer since the coordinates went in, and it is the whole question for anybody pointing an aerial, a telescope or themselves.
Both ends are named, because a great circle does not hold one course: Tokyo to London leaves north-north-west and arrives south-west, which is why the route looks bent on a flat map.
Asked with the verb in it, the far place is said first and answered second: a course is measured from where you are standing.

1.166.11 August 2026

Two more ways of asking how far

how many miles is tokyo from londonnothing5,943 miles
midpoint tokyo londonnothing69.02, 89.75
The verb between the unit and the first place, and the joining word inside the pair rather than in front of it: two ways of writing a question that was already answered in one way.
The second word of a unit is a second word of the unit -- nautical miles -- and not the joining word behind it, which the greedy reading took and then failed to look up.

1.166.01 August 2026

The moon, asked as a question

how many days until the full moonnothingin 5 days · Wed, 29 Jul 2026 · 10:37 am
is it a full moon tonightnothingno · waxing gibbous, 78% lit · the full moon is 29 Jul 2026
is it a full moon on 29 jul 2026nothingyes · full at 10:37 am
These are the two ways the moon actually gets asked about, and both were silent. Handing back the date and the instant answers a question nobody quite asked.
Same arithmetic, different headline: a countdown where a countdown was asked for, and a yes or a no where the question was a yes-or-no one.

1.165.01 August 2026

The moon on a night that has not happened yet

moon phase tomorrownothingwaxing gibbous · 86% lit
moon phase on 25 dec 2026nothingwaning gibbous · 97% lit
full moon in decembernothingWed, 23 Dec 2026 · 8:29 pm
The moon was only ever asked about tonight. The commonest night to ask about is not tonight: a walk, a photograph or a sky worth going outside for is planned for one that has not happened yet.
Whatever the date engine reads is the day, the way the sun already takes one, so every date this calculator knows can be the night.

1.164.01 August 2026

The solstices and the equinoxes

june solstice 2026nothingSun, 21 Jun 2026 · 4:24 am
when is the equinoxnothingTue, 22 Sep 2026 · 8:16 pm
winter solsticenothingMon, 21 Dec 2026 · 3:54 pm
The longest day has been answerable since the sun went in, and it is not the same fact: the solstice is an instant, the day is the day it lands in, and a calendar prints the first.
The season names are answered as the reader's own hemisphere means them. "summer solstice" asked from Sydney is December, because telling somebody the season they are not in is not an answer.
Good to about a quarter of an hour, which the answer says out loud. The perihelion the sunrise equation counts from is held at its value for the year 2000, and half a degree of drift is half a day of sun, so the same equation read the usual way came out eleven hours late.

1.163.01 August 2026

The golden hour, and the blue one

golden hour in tokyonothing6:17 pm → 7:11 pm (54m) · morning 4:26 am → 5:20 am
blue hour in londonnothing9:28 pm → 9:45 pm (17m)
Both are elevations rather than events, which is why they were the two sun questions this file could not answer while answering the rest. The sunrise equation takes whatever angle it is asked for and has since it went in.
Golden light is the sun between four degrees below the horizon and six above it; the blue hour is the two degrees below that. Neither is an hour, and both say how long they actually last.
The evening one leads, because that is the one people plan around: the morning one asks you to be standing there before dawn. Both are printed, since the question does not say which.

1.162.01 August 2026

How long until sunset

how long until sunsethow long until isn't a place I knowin 3h 41m · 8:21 pm in New York
how long until sunset in tokyonothingthe same, for the clock there
how long since sunrisenothing6h 14m ago
What somebody standing outside wants to know is not when the sun sets but how long they have got. The instant has been computable since the sun went in and the clock has counted to a time of day since the spans did, and nobody had put the two together.
A sun time already gone is tomorrow's, the way "hours until 9am" asked at ten in the morning means tomorrow morning. Asked backwards, one still to come is yesterday's.

1.161.01 August 2026

First light, nightfall, and the other names for the same instant

first light in londonnothing4:30 am in London
nightfall in parisnothing10:21 pm in Paris
twilight in tokyonothing7:22 pm in Tokyo
hours of daylight in londonnothing15h 50m
The civil twilights have been computed here since the sun went in, under the names "dawn" and "dusk". These are the same two instants said the way people say them out loud, and they cost no arithmetic at all.

1.160.11 August 2026

A span of clock time with a place on the end

3pm to 4pm in tokyoto 4pm isn't a place I know1 hour
9am in new york to 5pm in tokyonew york to 5pm isn't a place I know19 hours
Two clocks with a range word between them is a span of time whatever places are hung on either end, and the clock grammar was reaching the second half of the line and blaming it for not being a city.
A place said once at the end is meant for both ends: an afternoon written that way is one afternoon in one city, not an afternoon spread across two.

1.160.01 August 2026

A shift, written the way a rota writes it

9am to 5pmnothing8 hours
15:00 to 17:30nothing2 hours 30 minutes
10pm - 6amnothing8 hours
"hours between 9am and 5pm" has answered since the clock spans went in, and nobody writes the word "hours" on a rota.
Both ends have to be a clock that says it is one, an am or a pm or a colon, which is what keeps this off "23 jul to aug" and every other range the date grammar has always read.

1.159.01 August 2026

The name somebody writes in front of a line

Price: 6 times 5nothing30
Deposit: 20% of 4500nothing900
Fee: 20 km in milesnothing12.4274 miles
That is how a calculation gets written down when there is more than one of them, and the words in front of the colon are for the person reading it back tomorrow rather than for the calculator.
A clock keeps its colon. Letters and spaces only in front of it, and not too many of them, so "3:30 in tokyo" is a time and a colon halfway down a long sentence is punctuation.

1.158.01 August 2026

Names for things

rent = 1200nothingrent = 1200 · kept in this browser
rent * 12nothing14,400
speed = 20 km, then speed in milesnothing12.4274 miles
varsnothingthe names you have saved
clear rentnothingrent forgotten
A calculator is used twice in a row more often than once, and the second question is nearly always about the first answer. Everything else here is a rule; this is the one thing that has to be remembered.
What is stored is the text on the right of the equals rather than the answer it came to, so "budget = 1200 usd" uses the rate at the moment you ask rather than the rate when you typed it.
A name is written out before any reader sees the line, which is what makes one substitution serve the whole grammar: a saved name works in a sum, a conversion, a date and a clock alike.
A name this calculator already uses is not free. "km", "may", "max", "pi", "usd" and "tokyo" all go on meaning what they meant, because a variable that took one of those would hand back a wrong answer to a sentence with nothing wrong in it.

1.157.01 August 2026

Two facts about your screen, typed rather than assumed

ppi = 320nothing320 px per inch · 1 cm is 125.984 px
1 cm in px37.7953 px125.984 px, once ppi is 320
em = 14pxnothing14 px per em · 16 px is 1.14286 em
The screen in front of you is probably not 96 pixels to the inch and its text is probably not 16, so the two numbers the table cannot know are typed rather than assumed.
Nothing is applied while the line is being typed: halfway through "ppi = 320" the box says 3, and a setting that took that would have to be argued out of it. Enter applies it, and this browser keeps it.
Every row already on the page is re-read underneath it, so "1 cm in px" written before the setting answers for the new screen.

1.156.01 August 2026

The screen is a length once you say how dense it is

1 cm in pxpx isn't a unit I know37.7953 px · 96 px per inch
16 px in emnothing1 em
2 em in pxnothing32 px
1 pica in mmnothing4.23333 mm
A CSS pixel is 1/96 of an inch by the specification, which is a definition exactly like the inch, and a browser's default text is 16 of them. The arithmetic was already here; the two units were not.
Both numbers are assumptions about somebody else's screen rather than measurements, so every answer that leans on one says which it leaned on.
"pt" stays a pint. The CSS point is spelled csspt here, because a unit that is sometimes a drink is a unit that is sometimes wrong.

1.155.11 August 2026

The question asked in the middle of the sentence

9am in tokyo is what time in londontokyo is what time isn't a place I know1:00 am in London
what time is 3pm est in pstis 3pm est isn't a place I know12:00 pm in Los Angeles
convert 9am tokyo to londonnothing1:00 am in London
Spoken aloud, the question sits in the middle of the sentence rather than at either end, between the clock and the place it is wanted in. Read as part of a place name it produced a refusal built out of the question itself.

1.155.01 August 2026

Here, said in words

3pm tokyo in my timemy time isn't a place I know2:00 am in New York
how far is tokyo from meme isn't a place I know10,851.1 km
what time zone am i innothingEastern Daylight Time
Somebody asking this does not think of where they are sitting as a place with a name. "me", "here", "local time", "my timezone": every one of them was handed to the place resolver and blamed for not being a city, which is a true sentence and a useless one.
They resolve rather than being added to the zone table, so none of them turn up in the suggestions: they are a way of saying a place, not a place.

1.154.01 August 2026

The two-letter zones a meeting is written in

3pm et to ptpt isn't a place I know12:00 pm in Los Angeles
3pm ct to mtnothing2:00 pm in Denver
ET, CT, MT and PT are how a meeting is written down more often than EST and PST are, because they do not commit to a season: an invitation says 3pm ET precisely so it need not say EST in January and EDT in June.
PT is a pint to the converter, and a name the units own is kept out of the zone table on purpose. It is read as a zone only where a clock time is standing in front of it, so "3 pt in litres" is still a conversion.

1.153.11 August 2026

The word now, said before the place instead of after it

time now in tokyonow isn't a place I know9:00 am in Tokyo
time right now in tokyoright now isn't a place I know9:00 am in Tokyo
"time in tokyo now" answered and "time now in tokyo" did not. The word was dropped off the end of a line and not off the front, so it ended up inside the place name and was blamed for not being a city.

1.153.01 August 2026

Is tokyo ahead of london

is tokyo ahead of londonnothingyes · Tokyo is 8 hours ahead of London
is los angeles ahead of new yorknothingno · Los Angeles is 3 hours behind New York
is tokyo aheadnothingyes · Tokyo is 13 hours ahead of New York
The number has been answerable since the zones went in, and this is the question underneath it: somebody deciding whether to send a message now wants a yes, not thirteen hours.
A no is never only a refusal. The line underneath says the true direction whichever way the answer falls, because being told "no" and not being told "behind by three" is half an answer.

1.152.01 August 2026

The other end of an ahead-or-behind question

how many hours ahead is tokyo of londonnothingTokyo is 8 hours ahead of London
how far behind is los angeles from new yorknothingLos Angeles is 3 hours behind New York
The place compared against was only read in front of the subject. Said out loud the sentence puts it behind: "ahead is tokyo of london", which read as one long place name and answered nothing.

1.151.01 August 2026

A time difference with no word between the places

time difference tokyo londonnothingLondon is 8 hours behind Tokyo
time difference new york tokyonothingTokyo is 13 hours ahead of New York
time difference tokyo narnianothingnarnia isn't a place I know
The joining word was required and is not always typed. Two place names with nothing between them is how this gets asked once somebody has asked it twice, and it read as one long place name that does not exist.
It splits the way the distance reader splits: the joining word first, then every plain gap, and the first split that names two places wins.

1.150.01 August 2026

When is christmas

when is christmasnothingin 154 days · Fri, 25 Dec 2026
when is thanksgiving 2027nothingThu, 25 Nov 2027
when was easternothing110 days ago · Sun, 5 Apr 2026
"christmas" has answered since the holidays went in and "when is christmas" has not, which is the same question with the word everybody actually asks it with on the front.
The past tense is read as one: "when was easter" is not a question about the Easter that has not happened yet, so it answers with the last one rather than the next.

1.149.031 July 2026

The word people ask a flight in

flight tokyo to londonnothing11h 8m
flight from vladivostok to dubai timenothing8h 21m
tokyo to london flight timenothing11h 8m
how many hours is the flight from tokyo to londonnothing11h 8m
flight to tokyonothing12h 33m · New York → Tokyo
The sentence this was written for was "how long is the flight from tokyo to london", which is the longest way anybody says it. The noun on its own is the question, wherever in the line it lands and whether or not "time" is said after it.
The trailing keyword is the weak one, the way the trailing "distance" is: it answers only when both halves turn out to be places, and blames nobody when they do not.
how far apart are tokyo and londonapart are tokyo isn't a place I know9,564.34 km
when does the sun rise in tokyonothing4:43 am in Tokyo
sunrise tomorrow in tokyotomorrow in tokyo isn't a place I know4:44 am in Tokyo
1000 days agonothingSat, 28 Oct 2023
what is the date in 90 daysnothingThu, 22 Oct 2026
how long ago was 1 jan 2020nothing2,396 days ago
Four more silences in the same family, found by typing the questions rather than the grammar: the word "apart", the word "when", a day said before the place it is about, and a count of four digits, which was being read as a year with the unit left over behind it.

1.148.231 July 2026

The source is twenty-seven modules; the page still gets one file

Nothing you can type changes, and not one byte of what the page serves moved: public/calc.js is now built by concatenating src/, and the build is a concatenation and nothing else.
One file is still what gets delivered on purpose. Serving the modules separately would cost about a tenth of the compressed size again, and would stop the page opening from disk, since browsers refuse to load a module over file://.
A name is now something a module owns: the build refuses to produce a file where two modules declare the same thing at the top level. That had happened twice, silently, and the suite passed both times.
Fixed one of those two: a bill formatter and the currency formatter were both called fmtMoney, so bills were being written by the currency one with no currency to write them in.

1.148.131 July 2026

The README catches up with twenty-five releases

Nothing you can type changes. The page had shipped twenty-five additions and four fixes without the README naming one of them, which makes it a description of a calculator that no longer exists.
The table gains the moon, the day counts, the constants, the bills, the bits, the words, the formats and the rest; four new sections carry the arguments that needed more than a row.
The test count on that page said 4,108 and the suite runs 13,754, a number that had been quietly wrong for long enough that nobody was going to notice it.

1.148.031 July 2026

The moon

moon phasenothingwaxing gibbous · 73% lit
next full moonnothingWed, 29 Jul 2026 · 10:37 am
next new moonnothingWed, 12 Aug 2026 · 1:38 pm
The sun has been answerable here since the coordinates went in, and the moon is the other light people plan around: a walk without a torch, a photograph, a tide, a night worth going outside for.
Lunar New Year and Diwali are refused in this file because the arithmetic everybody ships disagrees with the published dates. That refusal is about a calendar built on a moon, not about the moon: the instant of a full moon computes to the minute, and these agree with the published times to within one.
The full moon is computed rather than assumed to sit halfway between two new moons, since the moon runs fast at perigee and can fall half a day off the middle of its cycle.

1.147.031 July 2026

The other two means, and two names that were missing

geometric mean of 2 8nothing4
harmonic mean of 30 60nothing40
truncate 4.9nothing4
A geometric mean averages a growth rate or a ratio and a harmonic mean averages a speed over a fixed distance. In both of those the arithmetic mean is not a different number, it is the wrong answer.
"trunc" answered and "truncate" did not, which is four letters of a programming language standing in for a word.
"3.14159 to 3 sig figs" needs no verb in front of it: the phrase already names what it wants done.

1.146.031 July 2026

A date written back out in the shape you need

today as dd/mm/yyyynothing24/07/2026
christmas as mm/dd/yyyynothing12/25/2026
today as iso weeknothing2026-W30-5
This file reads a date in every shape anybody writes one and could write it in exactly one, which is a translator that only speaks its own language.
Half the times a date gets looked up it is being copied into something: a form that wants the American order, a filename that wants the sortable one, a field that will not take a spelled-out month.
The ISO week date carries its own surprise, its year not always being the year its days are in, so the plain date goes underneath it.

1.145.031 July 2026

The Julian day, and the spreadsheet serial

julian daynothing2,461,246
excel serial 45000nothingWed, 15 Mar 2023
excel serial 60nothing29 February 1900, a day that never happened
Ten calendars answer here and neither of these is one. They are a running count of days from a fixed morning, which is what you reach for when you want to subtract two dates without months getting in the way.
The Julian day begins at noon, which is its whole point: an astronomer works through a midnight and does not want the date changing halfway.
The spreadsheet count is one out on purpose. Lotus treated 1900 as a leap year, Excel copied the bug for compatibility, and everything since has copied Excel, so day 60 is a 29th of February that never happened.

1.144.031 July 2026

Money over time

1000 at 5% for 10 yearsnothing1,628.89
mortgage on 300000 at 6% for 30 yearsnothing1,798.65 a month
doubling time at 7%nothing10 years 3 months
All three are one line of arithmetic and all three are the arithmetic nobody does. A percentage is easy; a percentage applied ten times over is not, which is why compound interest is the thing everybody is told to understand and few ever work out.
Compounded once a year unless the line says otherwise, and the answer says which, since the same rate compounded monthly is a different number.
The rule of 72 goes under the exact doubling time, because the rule is what most people are carrying and the use of an exact figure is knowing where the shortcut stops being close enough.

1.143.031 July 2026

The constants, which are rules rather than facts

speed of lightnothing299,792,458 metres per second
speed of light in mphnothing670,617,000 mph
avogadro numbernothing6.02214076 × 10²³ per mole
Since 2019 the SI is defined the other way up: the second and the metre are fixed by giving these numbers exact values. The speed of light is not measured at 299,792,458 metres per second, it is that.
Which makes them the same kind of thing as a unit factor or a leap-year rule, and they belong here for the same reason: nothing about one of them can go stale.
The two that are measured say so, since an answer that will not admit which of its digits are settled is claiming more than it has.

1.142.031 July 2026

A number written out in words, both ways round

1234 in wordsnothingone thousand two hundred and thirty-four
1004 in wordsnothingone thousand and four
two million in digitsnothing2,000,000
Roman numerals have read both ways round since they went in, which is the rarer notation by a long way. The one everybody has to write is the one on a cheque, where a figure is repeated in a form that cannot be altered with a pen.
Said the way it is said, with the "and" a hundred takes in front of what follows it, and a decimal read digit by digit, since "point fourteen" says nothing about where the point is.
Read before the rewrites, since the first thing those do to "two million in digits" is turn its words into the digits it was asking for.

1.141.031 July 2026

A tip, and a bill split between the people who ate it

20% tip on 60nothing72.00 · 12.00 tip
split 120 between 4 with 20% tipnothing36.00 each
split 91 between 3nothing30.33 each · 1 penny short
Both of these are percentages and division, which this file has done since the first week, and neither is the sum anybody wants: "20% of 60" is twelve and the number wanted is seventy-two.
The arithmetic was never the difficulty. The answer is two numbers and a calculator gives one, so the second gets done in the head at the table, which is where it goes wrong.
Two decimal places, because a bill has to be paid in pennies, and the pennies left over by a split that does not divide are counted rather than left to be discovered.

1.140.031 July 2026

Fixed: a conversion that handed the question back

100 mbps in mb/s100 Mbps100 Mbps · the same unit twice
100 km in kilometres100 kilometres100 kilometres · the same unit twice
The number came back unchanged with nothing said about why, which reads as a conversion that ran rather than as two spellings of one unit.
For a data rate it says the reason as well: a capital B is the byte and nothing else is, so "mb/s" is megabits and "MB/s" is eight times fewer. That eight is the whole reason anybody is confused about how long a download takes.

1.139.031 July 2026

Fixed: the age reader answering questions it had not read

retirement date if born 196066 years 6 months 23 daysnothing
pension age if born 196066 years 6 months 23 daysnothing
Anything at all could stand in front of "born", so every line with a birth date somewhere in it was answered as an age, whatever else it asked for.
A question asking for a date, answered with a number of years, by a reader that never looked at the first two words and gave no sign of it. A question this file cannot answer has to look unanswered.
The words that do belong in front of it are listed, and every way of asking an age keeps its answer.

1.138.031 July 2026

Fixed: a line of ordinals read as a date

1st 2nd 3rdSat, 1 Feb 2003nothing
1st 2ndSun, 1 Feb 2026nothing
Every written date marks at most one of its parts: "the 3rd of May 2027" marks the day and leaves the month and the year alone. A second mark says these numbers were never a date.
A wrong date stated confidently is the one outcome this engine exists to avoid, since nothing about it looks different from a right one.

1.137.031 July 2026

The operators that work on the bits

12 xor 10nothing6
5 << 25 Feb 202620
0xff & 0x0f12 Oct 202615
A number written in another base has read since the bases went in, and there was nothing to do to one. The reason anybody looks at 255 as 11111111 is to mask part of it off, shift it along or flip a bit in it.
Two of these lines were being read as dates, which is worse than answering nothing: a shift is not a day in February.
The bits are shown, since an answer in decimal to a question about bits has been converted back out of the notation that shows what happened.
"and" and "or" on their own stay out: they are the busiest joining words here, and a reader owning them would reach into every range and every list on the page.

1.136.031 July 2026

Fixed: a span rounded to the hour lost the half hour

hours between 9am and 5:30pm9 hours8 hours 30 minutes
hours between 9am and 5:15pm8 hours8 hours 15 minutes
A working day with half an hour quietly added to it, and the true figure was sitting underneath in minutes, so the answer contradicted its own footnote. The headline is the half anybody reads.
The unit asked for still leads, since that is what asking for hours means. What was under it is said in the next unit down instead of vanishing.
Seconds still round, having nothing smaller to be said in, which is the one place the rounding is not a choice.

1.135.031 July 2026

Whether the clocks have moved yet

is it dst in new yorknothingyes · summer time · UTC-4
is it daylight savings in sydneynothingno · standard time · UTC+10
does tokyo observe dstnothingno
When the clocks next move has answered since the clock changes went in, which is the question about the future. The question about right now is the one that gets asked.
An offset is half a fact without it: a meeting written down in January as "3pm New York, UTC-5" is at a different hour in July, and which of the two a place is keeping today settles whether the note still means anything.
The larger of a zone's two offsets is its summer one in both hemispheres, so the southern half needs no rule of its own.

1.134.031 July 2026

A mark out of a total

42 out of 60nothing70%
42 out of 60 as a percentnothing70%
The three orders this question already answered all carry the word "percent", which is the shape the line has when somebody already knows what they want.
A mark on a test, a poll, a count of anything against a total is written "42 out of 60" and wants a percentage without having said so, that being the only reason to write two numbers down that way round.
The mark itself goes underneath, since a percentage on its own has lost the two numbers it came from.

1.133.031 July 2026

A length of time as a stopwatch prints it, and two of them added

1h 30m in minutesnothing90 minutes
5m30s in secondsnothing330 seconds
2h 30m + 45mnothing3 hours 15 minutes
"1 hour 30 minutes in minutes" has read since the compound quantities went in, and the short form had nowhere to go. "m" is metres everywhere else here, and the unit in front of it settles it: nobody writes down an hour and thirty metres.
The parts may run together, since the letters do the work the spaces would have done.
Two lengths added is the sum done off a stopwatch or a timesheet, and it had no reader at all: this could move a clock by an hour and a half and could not add one to another.

1.132.031 July 2026

Whether a number is odd or even

is 12 evennothingyes
is 17 evennothingno, so it is odd
is 12 odd or evennothingeven
The plainest thing anybody asks about a whole number, and the one thing this could not say about one, while answering about that same number whether it is prime, square, triangular, perfect or abundant.
A no says what the number is instead, since here the two answers are the whole of the question: "17 is not even" and "17 is odd" are the same sentence and only one of them has told you anything.
Asked as the choice it is, too, which is how it gets typed by somebody who does not have one of the two words in mind already.

1.131.031 July 2026

10C3, the way a textbook prints it

10C3nothing120
10P3nothing720
nCr 10 3nothing120
"10 choose 3" is how it is said and 10C3 is how it is written, and this read only the saying of it. A textbook prints the welded form and a calculator has nCr on a key, so both of the shapes anybody copies were missing.
The two numbers may now be separated by a space alone once the name is in front of them, since a comma between two things that are plainly two things is punctuation nobody types. "gcd 12 18" comes along with it.

1.130.031 July 2026

How long until a time of day

hours until 5pmnothingin 21 hours
minutes until 3pmnothingin 1,140 minutes
hours until noonnothingin 16 hours
The span reader wants both ends, which is right for the length of an afternoon and wrong for the afternoon you are sitting in: nobody types the time it is now.
Midnight has been countable since the day engine learned clock units, and it is the only time of day that engine can hold, a day boundary being the only clock reading a day-granular thing carries. Every other hour had nothing to be counted to.
A time already gone today is that time tomorrow, and the answer says which. Midnight stays where it was, so no line has two readers.

1.129.031 July 2026

The clock takes the sign spelled out

3pm plus 90 minutesnothing4:30 pm
3pm minus 90 minutesnothing1:30 pm
now plus 3 hoursnothing11:00 pm
The sums have read "plus" and "minus" as words since the day they went in. The clock read only the two marks, so the same sentence answered with a sign and stayed silent with a word.
Turned into the marks in one place rather than taught to the pattern, which reads them twice and would have wanted teaching twice.

1.128.031 July 2026

What the date is

what is the datenothingFri, 24 Jul 2026
todays datenothingFri, 24 Jul 2026
what is the date in tokyonothingFri, 24 Jul 2026 in Tokyo
The plainest thing a calendar can be asked, and one of the few this could not answer at all.
"today" has always read, and it answers with the word "today", which is true and is not what was asked: somebody typing this wants the date spelled out, because they are about to write it down on something.
A place may follow, since for a third of every day the date somewhere else is a different date, and that is the only reason to ask about anywhere but here.

1.127.031 July 2026

Which week a date falls in, and which quarter

what week is 25 dec 2026nothingWeek 52 of 2026
what quarter is christmasnothingQ4 2026
which day of the year is christmasnothingDay 359 of 365
"what week is it" has answered since the periods went in, which is the wrong half to have on its own: today is the one day a reader can find out by looking at anything to hand.
The week a meeting falls in and the quarter a deadline lands in are what actually gets looked up, and both are about a date somebody is holding.
Anything the date grammar reads stands on the right, so a feast or a weekday works as readily as a written date, and an impossible date is still reported as one.

1.126.031 July 2026

Trigonometry with the angle in degrees

sin 30 degreesnothing0.5 · degrees
cos 60 degnothing0.5 · degrees
tan(45°)nothing1 · degrees
The sums answer in radians and have always said so, which is right for a calculator and no use to somebody holding a protractor. A line that names its unit outright got nothing at all.
The conversion is written into the sum rather than done quietly, so what the parser adds up is what a reader would have typed themselves, and the echo can tell the two units apart by looking at it.
The inverse functions are left alone, since their argument is a ratio and it is their answer that is an angle.

1.125.031 July 2026

Per cent, spelled out

12.5 percent of 340nothing42.5
15 percent off 200nothing170
1200 + 15 percentnothing1,380
50 percent as a decimalnothing0.5
Seven rules here read the sign and not one of them read the word, which is the wrong way round: the sign gets typed by somebody with the key in mind, and the word by somebody saying the sentence.
The word becomes the sign once, so every one of those rules gets it at the same moment instead of growing a spelled-out twin. "per cent" and "pct" come along with it.
Not in front of "points", since a rise of five percentage points is not five per cent and telling those two apart is the whole reason that answer exists.

1.124.031 July 2026

The name of the sum, said after the numbers

1 2 3 4 and 10 24 30 42 correlationnothing0.989778266557
1 2 3 averagenothing2
1 2 3 4 mediannothing2.5
Every list reader wanted its word in front, which is the order a function is written down in rather than the order a question arrives in: you type what you have, and then what you want done with it.
Both readers now see the line with any trailing name moved to the front, so the word order is settled in one place and the two of them cannot disagree about it.
Two numbers at least, since one number and a short word is something else nearly every time: "90 min" is still an hour and a half.

1.123.031 July 2026

The chips advertise the grammar that arrived this week

what week is it(never offered)a chip
when is sunset earliest in vienna(never offered)a chip
midpoint between karachi and vancouver(never offered)a chip
how old will i be in 2044 if born 12 mar 1991(never offered)a chip
Fifty-eight things were added and not one of them was on a chip, so the row still advertised the calculator as it was a week ago. A grammar nobody can discover is a grammar nobody types.
Five new groups, since the sun, the holidays, the period we are in, ages and unix time each answer several questions now and had at most one chip between them.
Twenty groups where there were fifteen, and thirteen chips shown, so the row is different on every visit instead of being the same list with two swapped.

1.122.031 July 2026

What year it is in another calendar

what year is it in the hebrew calendarnothing5786
what year is it in the islamic calendarnothing1448 AH
what year is it in the persian calendarnothing1405 AP
japanese yearnothing8 Reiwa
The whole date has been readable since the calendars went in, and the year on its own is the part anybody asks for out loud: a year is what a calendar is identified by.
The whole date goes underneath, since a year in a calendar most readers do not use is a number with nothing to hold on to.
The number comes from the same formatter the full date does, so there is one place a calendar is read and no chance of two of them disagreeing.

1.121.031 July 2026

Saying why a day is not here

when is chinese new yearnothingLunar New Year isn't in here: it is set by a new moon rather than by a rule…
when is diwalinothingDiwali isn't in here: it falls on a lunisolar month whose length is observed rather than fixed…
The reasoning was written down beside the calendars and never said out loud, so the answer was silence, and silence reads as ignorance.
It looked like a calculator that has never heard of the largest annual holiday on earth, rather than one that has thought about it and refused.
Every other refusal here says why. These are the only ones where the reason is a judgement rather than a bound, which makes saying it more important and not less.

1.120.031 July 2026

A year named, in Roman numerals

next year in roman numeralsnothingMMXXVII
this year in romannothingMMXXVI
christmas in roman numeralsnothingMMXXVI
Roman numerals are for years nine times out of ten, and every one of those questions is about a year somebody would rather name than count out.
The left side is handed to the date grammar, which has known all of those since it was written.

1.119.031 July 2026

Two bases at once

255 in hex and binarynothingff and 11111111
255 in hex and octalnothingff and 377
10 in binary and hexnothing1010 and a
The same courtesy the units and the currencies were shown, and worth more here: a number looked at in one base is usually being looked at in the others too, that being what a base is for.
The same splitter and the same both-or-neither rule, so one base beside one refusal never happens.

1.118.031 July 2026

Hex of 255, said that way round

hex of 255nothingff
binary of 10nothing1010
base 16 of 255nothingff
"255 in hex" is a conversion written out. This is how the same thing is said when the base is the thing being asked for, and it is the order every other "give me X of Y" question on this page takes.
Loose on purpose and safe because of what it is checked against: the first word has to name a base, so "sum of 1 2 3" and "factors of 360" come nowhere near it.

1.117.031 July 2026

Unix time for a date, said that way round

unix time for christmasnothing1798156800
timestamp of christmasnothing1798156800
epoch time for 25 dec 2026nothing1798156800
The date had to come first, which is the order a conversion is written in and not the order a question is asked in.
"unix time for christmas" puts the thing wanted at the front, the way "distance from tokyo to london" and "sunrise in london" both do.

1.116.031 July 2026

Seconds since the epoch, and milliseconds

seconds since epochnothing1784851200
milliseconds since epochnothing1784851200000
unix time in millisecondsnothing1784851200000
"unix time" is what a programmer calls it and answered already. "seconds since the epoch" is what it is, and is how everybody who has to explain it writes it down.
The milliseconds were on the detail line all along and there was no way to ask for them.

1.115.031 July 2026

Seconds, which were the one clock unit not counted in

seconds until midnightnothingin 100,800 seconds
seconds until christmasnothingin 13,323,600 seconds
seconds in a daynothing86,400 seconds
Hours and minutes have driven a count since the clock units went in. Seconds did not, though a countdown is the one thing anybody counts in them.
Not the bare "s": it is already noise, being what is left of "what's" once the apostrophe goes, and a driver owning it would take the front off every question asked that way.

1.114.031 July 2026

Turning an age, and an age at a date

when do I turn 40 if born 5 jun 1990nothingWed, 5 Jun 2030
how old will I be in 2050 if born 5 jun 1990nothing59 or 60
how old will I be on 1 jan 2050 if born 5 jun 1990nothing59 years 6 months 27 days
"born 5 jun 1990" answers how old somebody is now, which is one instant of a question people ask about every instant of their lives.
A year named on its own is two ages, and saying so is the point: somebody born in June is 59 for half of 2050 and 60 for the rest, and one number would be wrong half the time without ever looking wrong.

1.113.031 July 2026

Anniversaries

10th anniversary of 5 jun 2020nothingWed, 5 Jun 2030
50th anniversary of 20 jul 1969nothingSat, 20 Jul 2019
1st anniversary of christmasnothingSat, 25 Dec 2027
The offset grammar has added ten years to a date since it was written, and "5 jun 2020 + 10y" is how it had to be asked. That is the sum rather than the question.
A 29 February anniversary lands on the 28th in a year without one, and the answer says so rather than leaving the reader to notice the day changed.

1.112.031 July 2026

Leap years counted over a span

leap years between 2000 and 2100nothing25 leap years
how many leap years since 2000nothing7 leap years
leap years in the 21st centurynothing24 leap years
One at a time is one answer; the run is another, and it is the one the century rule is interesting for.
Between 2000 and 2100 there are 25, and the arithmetic anybody does in their head says 26, because 2100 is not one.
Where the list is too long to read, the answer names the centuries taken out instead, since those are the whole reason the count is not the division you expect.

1.111.031 July 2026

The next leap year

next leap yearnothing2028 · 2 years away
previous leap yearnothing2024
next leap year after 2096nothing2104 · 8 years away
The rule could only ever be asked about a year somebody already had in mind, which is the backwards half of the question: the reason anybody looks a leap year up is to find out when the next one is.
Walked rather than worked out. The longest gap the Gregorian rule allows is eight years, 2096 to 2104, so eight tests settle it and the walk cannot disagree with the rule.

1.110.031 July 2026

A quantity with nothing said to convert it into

5 kmnothing3.10686 mi · 5,000 m · 16,404.2 ft
180 lbnothing81.6466 kg
20 cnothing68 f
convert 5 kmnothing3.10686 mi
The shortest thing anybody types at a converter, and it answered nothing, which reads as "I do not know that unit" when the truth is "I do not know what you want".
What they want is nearly always the other system, that being why anybody converts a length at all, so each dimension names the handful of units its questions get asked in.
Time is deliberately absent: "3 weeks" is a date offset, and a converter claiming it would answer 504 hours to somebody asking what the date is.

1.109.031 July 2026

Half a kilo

half a kilo in poundsnothing1.10231 pounds
a third of a mile in metresnothing536.448 metres
quarter of an hour in minutesnothing15 minutes
an eighth of a mile in feetnothing660 feet
A fraction in front of a size has been read since the sizes went in, and a fraction in front of a unit was not read at all, though it is the commoner sentence by a distance.
Nobody says "0.5 kg". They say half a kilo, and a quarter of an hour, and a third of a mile.
Only in front of something this file can convert, so "half a mind" is still not a quantity.

1.108.031 July 2026

Two currencies at once

100 usd in eur and gbpeur and gbp isn't a currency I have a rate for87.90 EUR and 75.05 GBP
100 usd in eur, gbpnothing87.90 EUR and 75.05 GBP
The same reading two units already got, handed to the currency reader instead. Which one takes the line is decided by which one answers, as everywhere else here.
The rate line is said once rather than twice, since both answers share their source and its date and an echo that repeats them reads as though the work had been done twice.
Before the currency reader rather than after, since one handed "eur and gbp" reports no such currency instead of noticing there are two of them.

1.107.031 July 2026

One quantity, two targets

20 c in f and knothing68 f and 293.15 k
100 km in miles and feetnothing62.1371 miles and 328,084 feet
1 kg in lb and oznothing2.20462 lb and 35.274 oz
A converter that takes one target makes you ask twice, and the second asking is the same line with three characters changed.
It costs no new arithmetic: the line is split at the "and" and each half handed to the reader that already answers it, so every unit and spelling comes along unchanged.
Both or neither, since one good answer beside one refusal is a worse reply than the refusal on its own.

1.106.031 July 2026

How many cm in a foot

how many cm in a footnothing30.48 cm
how many grams in a kilonothing1,000 grams
how many feet in a milenothing5,280 feet
how many seconds in a minutenothing60 seconds
The converter needs something to convert and this sentence names no amount. The amount is one, and saying "1 foot" out loud is what nobody does.
Not where the date grammar answers better: a month is 31 days in July and 28 in February, and turning that into a definition would be the wrong answer.

1.105.031 July 2026

Correlation, which needs two lists

correlation of 1 2 3 and 2 4 6nothing1
correlation of 1 2 3 and 6 4 2nothing-1
covariance of 1 2 3 and 2 4 6nothing2
Every reader in this section takes one list, which is right for every question it answers. The question people bring two lists to a calculator for is whether they move together.
Pearson's r, with the ends of its scale printed underneath, since r is on a fixed scale and the ends of that scale are the whole of how to read it.
A list that never changes has no spread to share, and nought would read as "no relationship" rather than "no question".

1.104.031 July 2026

Quartiles said in words

second quartile of 1 2 3 4nothing2.5
first quartile of 1 2 3 4nothing1.75
quartile 2 of 1 2 3 4nothing2.5
9th decile of 1 2 3 4 5 6 7 8 9 10nothing9.1
"q2" read and "second quartile" did not, and the words are what somebody who has not met the abbreviation types, which is exactly the reader who needs the answer.
The deciles come with them, being the same idea counted in tens, and they had no spelling here at all.

1.103.031 July 2026

The midrange

midrange of 1 2 3 4nothing2.5
midrange of 1 2 3 100nothing50.5
middle of 1 2 3 4nothing2.5
Halfway between the smallest and the largest, which is not the middle of the list and not the average of it: for 1 2 3 100 the median is 2.5, the mean is 26.5 and the midrange is 50.5.
All three were computable here and only two of them had names, though the midrange is what a thermostat and a weather forecast both mean by "average".

1.102.031 July 2026

How many numbers there are

count of 1 2 3 4nothing4
length of 1 2 3 4nothing4
count of 1 to 100nothing100
The one thing about a list this worked out for every other answer it gave and could not be asked for: every echo line here has ended in "of 7 numbers" since the list readers went in.
The count is also the one answer whose echo cannot name the count, since "count of 4 numbers" is the answer said twice. It shows the numbers instead.

1.101.031 July 2026

Solving for x

solve 2x + 3 = 11nothingx = 4
x^2 = 16nothingx = 4 or -4
x^2 + 2x - 8 = 0nothingx = 2 or -4
3(x+1) = 12nothingx = 3
A whole arithmetic engine, and no way to point it at the commonest sum anybody is ever set: the one with the answer missing from the middle instead of the end.
Solved by sampling rather than by rearranging: x is substituted with four numbers and the four answers say what shape the equation is, so this inherits every function and bracket the parser already knows.
Every answer is checked by putting it back in, and anything with more curve in it than a square is refused rather than answered wrongly.

1.100.031 July 2026

A hex literal where a number goes

what is 0xff plus 1nothing256
0xff * 2nothing510
0b1010 + 5nothing15
0b1010Sun, 29 Apr 202910
The bases grammar has read "0xff in decimal" since it went in. A literal is a spelling of a number rather than a conversion of one, so anywhere this takes a number it ought to take that spelling.
It did not, and the letters were read as a word: "0xff plus 1" went looking for a function called xff, and "0b1010" was read as an offset of a thousand and ten business days.

1.99.031 July 2026

Pi to a hundred places

pi to 10 placesnothing3.1415926536
e to 20 placesnothing2.71828182845904523536
phi to 10 placesnothing1.6180339887
tau to 10 placesnothing6.2831853072
A double holds fifteen significant figures and this page prints twelve, so "pi" here has always been 3.14159265359 and could not be anything else.
Asking for more had a wrong answer available: Math.PI padded out with the noise at the end of its binary expansion, which is the worst kind of answer to give.
So the digits are shipped, without apology. They are the one kind of constant that cannot go stale: the hundredth digit of pi was the same before anyone counted it.

1.98.031 July 2026

The nth Fibonacci number

fibonacci 10nothing55 · 21 + 34 = 55
10th fibonacci numbernothing55
fib(10)nothing55
the 12th fibonaccinothing144
Counted from F(1) = 1, which is the numbering anybody saying "the 10th Fibonacci number" out loud means, and the one that makes the 10th 55.
Added rather than solved. Binet's formula gives a closed form and gives it wrong somewhere in the seventies, which is inside the range this holds, and seventy-eight additions is not slow.
The two it is made of come with it, since that is the definition and also the check.

1.97.031 July 2026

Is 28 a perfect number

is 28 a perfect numbernothingyes · 1 + 2 + 4 + 7 + 14 = 28
is 12 a perfect numbernothingno · 1 + 2 + 3 + 4 + 6 = 16, so it is abundant
is 12 abundantnothingyes
is 8 deficientnothingyes
The divisors have been listable since "factors of 360" went in, and this is what they add up to.
Perfect numbers are rare enough that a bare "no" is the answer almost every time, so the sum is always shown along with which side of perfect the number falls on.

1.96.031 July 2026

Is 100 a square number

is 100 a square numbernothingyes · 10² = 100
is 50 a square numbernothingno · between 7² = 49 and 8² = 64
is 27 a cubenothingyes · 3³ = 27
is 10 triangularnothingyes · 1+…+4 = 10
"is 100 prime" has been answerable since the primes went in, and this is the same sentence with a different shape of number in it.
A no comes with the two it falls between, which is the useful half of a no: "50 is not a square" says nothing that "50" did not.
A cube may be negative and the other two may not, so -8 is a cube and -4 is not a square.

1.95.031 July 2026

The square of 5, said that way round

square of 5nothing25
cube of 3nothing27
reciprocal of 4nothing0.25
inverse of 8nothing0.125
"5 squared" reads and "the square of 5" did not, though the second is how it is said when the number is the thing being talked about.
The root already read both orders, because "square root of 16" is the only order it has. The power read one and the reciprocal read neither.
The operand is a number, a bracket or a name and nothing looser: run to the end of the line, "square of 5 + 3" would come out as the square of eight.

1.94.031 July 2026

A logarithm with its base said out loud

log base 2 of 1024nothing10
log base 3 of 81nothing4
log 1024 base 2nothing10
log_2(1024)nothing10
log2 and log10 are the two bases nobody has to name, because they have their own spellings. Every other base had no way in at all.
The two named bases are still used where they are asked for rather than computed as a ratio of natural logs, since log(1024)/log(2) is 10 to within a rounding error and this page prints eleven decimal places.

1.93.031 July 2026

Rounding that says how much to keep

round 3.14159 to 2 placesnothing3.14
round(3.14159, 2)nothing3.14
round 1234 to 3 significant figuresnothing1,230
round 1234 to the nearest 100nothing1,200
round() has taken one argument since the function list went in, which rounds to a whole number: the one rounding nobody has to ask a calculator for.
Scaled, rounded and scaled back, so a negative count works as well as a positive one and is the same arithmetic rather than a second rule.
Significant figures and the nearest something are offered for "round" only, floor and ceiling to three significant figures being a sentence nobody says.

1.92.031 July 2026

The primes below a number

how many primes under 100nothing25 primes
prime numbers under 50nothing15 primes · 2 · 3 · 5 · 7 · …
primes between 100 and 200nothing21 primes
how many primes under 100000nothing9,592 primes
Every other prime question here is trial division, which is right for "is 5,381 prime" and wrong for this. So this is the one place a sieve earns its memory.
"under 100" stops short of it and "up to 100" does not, which matters for exactly the numbers that are themselves prime.
Listed where a list is readable and topped and tailed where it is not: nine thousand numbers in a row is not an answer, and neither is a count with nothing to check it against.

1.91.031 July 2026

A run of numbers written as its two ends

sum of 1 to 100nothing5,050
average of 1 to 100nothing50.5
stdev of 1 to 10nothing3.0276503541
sum of 1 to 1000000nothing500,000,500,000
The list readers take numbers one at a time, which is right for the six or seven anybody types out and useless for the shape this question is nearly always asked in. Nobody writes a hundred numbers to add them up.
Materialised where the run is small enough to be a list, so median, spread and percentile all get it for nothing.
Past that, only the readings with a closed form, since a million numbers held in memory to add in order is a slow way of doing arithmetic Gauss did at nine.

1.90.031 July 2026

How long the flight is

how long to fly from tokyo to londonnothing11h 8m
how long is the flight from new york to londonnothing6h 41m
flying time from paris to berlinnothing1h 28m
The distance has been answerable since the coordinates went in, and dividing it by a speed is the step everybody was doing afterwards.
900 km/h and half an hour on the ground, printed on every answer, because this is the one figure in the file that is deliberately approximate and it should not look measured.
No wind and no route: a real Tokyo to London flight is an hour or more longer westbound, the jet stream being worth several hundred kilometres an hour and nothing here modelling it.

1.89.031 July 2026

The antipode

antipode of londonnothing-51.51, 179.87 · 882 km from Chatham
antipode of madridnothing-40.40, 176.32 · 415 km from Auckland
antipodes of aucklandnothing36.87, -5.23 · 83 km from Gibraltar
The one place a distance question has a fixed answer for: every antipode is 20,015 km away, half a circumference.
The interesting half is where it lands, so the nearest place this file knows is named alongside.
Latitude flips sign and longitude turns halfway round, wrapped properly, or half the world comes back with a longitude past 180 that no map takes.

1.88.031 July 2026

The midpoint between two places

midpoint between tokyo and londonnothing69.02, 89.75 · 4,782 km from each
midpoint of new york and londonnothing52.37, -41.30
midpoint between paris and berlinnothing50.82, 7.64
Not the average of the two coordinates. Averaging Tokyo and London puts halfway at 43.6°N; the halfway point of the flight is at 69.0°N, because the route goes over the top.
The nearest place the file knows is named alongside, since a coordinate in the middle of Siberia says nothing on its own and "1,412 km from Tomsk" says where it is.
No new data: the coordinates are the ones the sunrise times already read.

1.87.031 July 2026

The earliest sunset

when is sunset earliest in londonnothingFri, 11 Dec 2026 · 3:52 pm
latest sunset in londonnothingTue, 23 Jun 2026 · 9:23 pm
earliest sunrise in londonnothingWed, 17 Jun 2026 · 4:43 am
when is sunset earliest in tokyonothingSun, 29 Nov 2026 · 4:29 pm
The one everybody gets wrong. Sunset is earliest a fortnight before the solstice and sunrise is latest a fortnight after it, because solar noon itself drifts later through December.
In London the earliest sunset is on the 11th and the shortest day is the 22nd, and the answer names both, since those eleven days are the whole point of asking.
Compared by the clock on the wall, which is what "earliest" means, and costs an offset lookup a day: the same comparison done in UTC would be a comparison of something else.

1.86.031 July 2026

The longest day and the shortest

longest day in londonnothingSun, 21 Jun 2026 · 16h 38m
shortest day in londonnothingTue, 22 Dec 2026 · 7h 49m
longest day in sydneynothingTue, 22 Dec 2026 · 14h 25m
longest day in longyearbyennothing127 days of 24h 0m
Everything this needs has been here since the sunrise equation went in, and the question could only be answered by asking three hundred and sixty-five others.
Not quite the solstice: that is one instant for a whole hemisphere, and the longest day somewhere is whichever of that place's days holds the most daylight.
Inside the circles there is no one longest day, so the stretch is given instead: naming the first of 127 identical days would be picking one arbitrarily and printing it as the answer.

1.85.031 July 2026

The sun question with the question left in

how much daylight is there in london todaynothing15h 50m
how long is the day in londonnothing15h 50m
what time is sunrise in londonis sunrise isn't a place I know5:13 am in London
what time does the sun set in tokyodoes the sun set isn't a place I know6:53 pm in Tokyo
The keyword had to open the line or close it, and in real English it sits in the middle with a question on either side.
The keyword may be written apart and may be a verb: "what time does the sun rise" is the same question as "sunrise" and had none of its spelling.
The clock grammar reads the same opening words and is not this question, so it hands over rather than blaming a place nobody typed.

1.84.031 July 2026

Sunrise tomorrow

sunrise tomorrowtomorrow isn't a place I know5:47 am
sunset tomorrowtomorrow isn't a place I know8:20 pm
sunrise on fridayon friday isn't a place I knowFri, 24 Jul 2026
sunrise in junejune isn't a place I knowMon, 1 Jun 2026
A day and no place is how the question is asked from wherever you are standing, and every word was being offered to the place resolver instead.
"tomorrow isn't a place I know" is true and unhelpful, and it blames the day for not being a city.
A place still wins where there is one, and the day reads on exactly the terms it already read on after a place.

1.83.031 July 2026

A clock question with a length in it

what time will it be in 3 hours in tokyowill it be in 3 hours isn't a place I know12:00 pm in Tokyo
what time will it be in tokyowill it be isn't a place I know9:00 am in Tokyo
what time was it 3 hours ago in londonnothing10:00 pm in London
The clock grammar has moved a time by a span since it learned "5 hours after now", and only ever from a clock reading.
Asked the way it is spoken, with a question then a length then a place, nothing matched and the place resolver was handed the whole tail and blamed it for not being a city.
The tense may be any of the three, since the question gets asked in all of them.

1.82.031 July 2026

Is anybody at work there

is it business hours in tokyonothingYes, 9:00 am Fri in Tokyo
is it business hours in londonnothingNo, too early, they open at 9:00 am
is it working hours in new yorknothingNo, too late, they shut at 5:00 pm
is the office open in tokyonothingYes, 9:00 am Fri in Tokyo
Every part of this was here and none of them were joined up: the clock says what time it is there, the weekday rule whether it is a working day, the holiday tables whether the country has the day off.
Nine to five, Monday to Friday, said out loud on every answer. It is a convention rather than a fact, it is wrong for a Spanish afternoon and wrong for a trading floor, and a number that arbitrary has no business being implied.

1.81.031 July 2026

When the clocks change

when do the clocks change in londonnothingSun, 25 Oct 2026 · 2:00 am → 1:00 am
when does dst start in new yorknothingSun, 14 Mar 2027 · clocks go forward
when do the clocks change in sydneynothingSun, 4 Oct 2026 · clocks go forward
clocks change in tokyonothingTokyo doesn't change its clocks
Found by looking rather than by rule: the runtime carries the whole tz database, so a year is walked a day at a time and the gap halved wherever two neighbouring days disagree.
A table of rules written here would be a second opinion on data the file already has, and the second opinion is the one that goes out of date.
The direction is honoured where it is named, since "when does dst end" is a question about the autumn and the spring is a different answer.

1.80.031 July 2026

Which time zone a place is in

what timezone is boston innothingEastern Daylight Time · America/New_York · UTC-4
what time zone is kolkata innothingIndia Standard Time · UTC+5:30
timezone of sydneynothingAustralian Eastern Standard Time
A place has resolved to a zone since the first clock answer and the file never once said which zone, except as an id on an echo line nobody reads it off.
Somebody filling in a calendar invitation wants "Eastern Time", not "America/New_York" and not "UTC-4", though both are worth having underneath.
The names come from the runtime, which carries them for every zone it knows. Nothing is shipped, which is the bargain the calendars and the coordinates already take.

1.79.031 July 2026

The offset of one place

utc offset of tokyonothingUTC+9
utc offset of kolkatanothingUTC+5:30
how many hours ahead is tokyonothingTokyo is 13 hours ahead of New York
how far behind london is new yorknothingNew York is 5 hours behind London
Both numbers were on the page already and neither could be asked for: the offset is on the echo line of every clock answer, the gap is the headline of every two-place one.
A question about one place had to be padded out with a second before this would take it, and the second one people mean is where they are sitting.
The word asked with is answered even when the sign disagrees with it: asking how far ahead Los Angeles is deserves being told that it is behind.

1.78.031 July 2026

Holidays that fall on a weekend

how many holidays fall on a weekend in 2027 in the usnothing3 of 11 national holidays
how many bank holidays fall on a weekend in 2027 in the uknothing2 of 8 bank holidays
how many holidays fall on a weekend in the usnothing1 of 11 national holidays
The one thing a list of next year's holidays does not give you by being read out.
The count comes with what is done about it, since each country's answer is already here: the States move the day to the nearest weekday, Britain and Canada add one after.
A holiday on a Saturday costs a day in the States and costs nothing in Britain, and a bare count does not say which.

1.77.031 July 2026

Holidays in a month

holidays in july in the usnothing1 national holiday · 4 Jul Independence Day
holidays in the us in julynothing1 national holiday
holidays in 2027 in the usnothing11 national holidays
holidays in august in the usnothingno national holidays
A year could only ever be tacked on the end, so the two halves of the question had one order between them and the month had no place at all.
Whichever half names a country is the country and the other is the stretch, so both orders read.
A month with nothing in it says so in words. "0 national holidays" is arithmetic where a sentence belongs, and silence reads as not understood.

1.76.031 July 2026

Is today a holiday

is today a holiday in the usnothingNo · a working day in the US
is 4 jul 2026 a holiday in the usnothingYes, Independence Day
is 28 dec 2026 a holiday in the uknothingYes, Boxing Day
is christmas a holiday in the uknothingYes, Christmas Day
"what day is 4 jul 2026 in the us" answered it sideways, by naming the weekday first and mentioning the holiday after. Somebody deciding whether to send an invoice wants the word yes.
The holiday a day is, against the day an office takes off for it: the 4th of July 2026 is a Saturday and the States shut on the Friday, and the line says both.
A holiday belongs to a country, so being asked without one is a question with a hole in it rather than a question about nowhere.

1.75.031 July 2026

The next holiday

next holiday in the usnothingLabor Day · Mon, 7 Sep 2026
next bank holiday in the uknothingthe summer bank holiday · Mon, 31 Aug 2026
last holiday in the usnothingIndependence Day · Sat, 4 Jul 2026
next holiday in tokyonothingMountain Day · Tue, 11 Aug 2026
The list of a whole year was answerable and a whole year of dates is not what somebody wondering when the next long weekend is has asked for.
Strictly past today. A holiday you are standing in is not the next one and is not the last one either.
Where the day off is not the day itself, both are shown: one is when it is, the other is when the office shuts.

1.74.031 July 2026

A week on Tuesday

a week on tuesdaynothingTue, 4 Aug 2026
tuesday weeknothingTue, 4 Aug 2026
a week todaynothingFri, 31 Jul 2026
a fortnight on tuesdaynothingTue, 11 Aug 2026
How a fortnight's notice is given in half the English-speaking world, and a shape this had no reading for at all.
Read whole, since a word at a time "tuesday week" is a Tuesday with a stray unit behind it and "a week on tuesday" is a length with a day it cannot use.
Said on a Friday, "friday week" is seven days out and not fourteen: the day it names is the coming one and today counts as it.

1.73.031 July 2026

The Sunday before Christmas

the sunday before christmasnothingSun, 20 Dec 2026
the friday after easternothingFri, 2 Apr 2027
the monday before new yearnothingMon, 28 Dec 2026
An ordinal that is always "first" is one nobody says out loud, and requiring it was the whole difference between the sentence people write and the sentence this could read.
Only in front of a step away from a day: "sunday of june" names four Sundays and is not this question, so it stays what it was.
The article was not being skipped on the way in either, so "the 3rd friday of june" now reads as well as the version without it.

1.72.031 July 2026

A day counted from a named day

2nd sunday after easternothingSun, 11 Apr 2027
3rd friday before christmasnothingFri, 4 Dec 2026
1st monday after new yearnothingMon, 4 Jan 2027
3rd business day after christmas in the usnothingWed, 30 Dec 2026
A month was the only stretch this count could walk through, so every question anchored on a moveable feast had no shape at all, Easter being the reason half a calendar moves in the first place.
Strictly away from the day: Easter is a Sunday, and a first Sunday after it that answered Easter would be a week wrong every year.
"last friday before christmas" is the first one going backwards. "last friday after christmas" names no day at all and is left to say nothing.

1.71.031 July 2026

How far into a period we are

how many days into the year are wenothingDay 205 of 365
what day of the year is itnothingDay 205 of 365
how far into the quarter are wenothingDay 24 of 92
how many weeks into the year are wenothingWeek 30 of 53
"day 200 of 2026" has been readable from the other direction since the ordinal day went in: it answers which date that is. This asks which ordinal today is.
Weeks are counted in sevens from the first of the period and say so, since that is not the ISO week the page prints elsewhere.
Months into a month is not a question, and answering "1 of 1" would be a way of pretending it was.

1.70.031 July 2026

Since points backwards

days since christmasnothing211 days ago
days since easternothing110 days ago
days since halloweennothing266 days ago
days since mondaynothing4 days ago
Every recurring name in this file reads forwards, and "since" was filler, so it was thrown away and Christmas resolved to the coming one: a date nothing can have happened since.
This grammar already has a word for the last one, so the word is spelled "last" here and read by the rule that has always read it.
A date is not an occurrence of anything, so "days since 1 jan 2020" falls through to the filler the word has always been.

1.69.031 July 2026

What is left of a period

days left in julynothing7 days
how many days left this yearnothing160 days
working days left this year in the usnothing109 working days
how many mondays left this yearnothing23 Mondays
weeks left in the yearnothing22 weeks 6 days
"days in july" answers 31 on the 31st. It is true, and it is not what anybody standing inside July is asking.
Counted from tomorrow, because a day you are standing in is not a day you have left.
A period that has not started keeps all of itself, so "days left in september" is 30. One that has ended says so, which beats answering nought to a question about May asked in July.

1.68.031 July 2026

A counted working day is a day the office is open

3rd business day of july 2026 in the usFri, 3 Jul 2026Mon, 6 Jul 2026
1st business day of january 2027 in the usFri, 1 Jan 2027Mon, 4 Jan 2027
3rd business day of july 2026Fri, 3 Jul 2026Fri, 3 Jul 2026
One question asked two ways gave two answers. "1jul2026 + 3 business days in the us" stepped over the Friday the States take for the 4th; "3rd business day of july 2026 in the us" landed on it.
Without a country it is weekends and nothing else, exactly as before, because without one there is no telling whose holidays to skip.

1.67.031 July 2026

The month next door

first monday of next monthnothingMon, 3 Aug 2026
last day of next monthnothingMon, 31 Aug 2026
last day of last monthnothingTue, 30 Jun 2026
first day of next yearnothingFri, 1 Jan 2027
Nobody plans the first Monday of the month they are already most of the way through. The month a rota or a rent day is about is the next one, and it was the one this could not be asked about.
Read as a stretch rather than left to the offset grammar, which answers "next month" with this day next month and leaves no month to count inside.

1.66.031 July 2026

The month said the way it is said out loud

last day of this monthnothingFri, 31 Jul 2026
first day of this monthnothingWed, 1 Jul 2026
last day of this yearnothingThu, 31 Dec 2026
3rd friday of this monthnothingFri, 17 Jul 2026
"last day of the month" answered. "last day of this month" did not, because the article was the only word being skipped over on the way to the period.
It carries no date of its own, so what follows it is read exactly as "the month" and "the year" already were.

1.65.031 July 2026

The period we are in

what week is itnothingWeek 30 of 2026
what quarter is itnothingQ3 2026
what month is itnothingJuly 2026
what year is itnothing2026
Every period this reads answered the opposite question. "week 30" says which Monday week 30 opens on, "q3" which day the quarter starts, "july" the first of the month, and none of them could be asked which one we are standing in.
The span comes with it: 20 Jul 2026 to 26 Jul 2026, day 5 of 7, 2 days left.
The tail of a longer question stays with whoever owns it, so "what year is it in the hebrew calendar" is not answered 2026.

1.64.031 July 2026

An ordinal where only the first was allowed

10th prime under 300nothing241
3rd prime after 100nothing107
100th primenothing541
3rd largest of 5 3 9 1 7nothing5
2nd smallest divisor of 360nothing2
2nd largest prime factor of 360nothing3
Four grammars had the first and the last and nothing in between. The walk that finds the next prime was only ever asked to take one step.
Bounded by the work, not the count: the 100,000th prime is 42ms because the numbers tested are small, ten primes above a trillion is 141ms because each test has six digits' worth of factors to try.

1.63.131 July 2026

The footer stays where you can see it

The version and the other pages were three screens down this page. The footer is held at the foot of the window now, on the prose pages.
It still takes its own space, so the oldest release is not printed under it. The calculator keeps its own: the suggestion list opens downward into the same pixels.

1.63.031 July 2026

How long from one sun time to another

sunset to dawn in reykjavik 21dec2026nothing18h 34m · 3:30 pm → 10:04 am the next day
sunrise to sunset in londonnothing15h 50m · 5:13 am → 9:02 pm
29 mpg in litres per 100 kmnothing8.11085 l/100km
500 km at 8 litres per 100 kmnothing40 l
Both fuel spellings were in the table all along. The reader could not see a unit with a space or a digit in the middle of it.

1.62.031 July 2026

Ten countries outside Europe know their holidays

holidays in japannothing14 national holidays
what day is it in mumbaiFriday in Mumbai · a weekdayFriday in Mumbai · a working day in India
what day is 6 may 2026 in japanWednesday · a weekdayWednesday · Children's Day, observed in Japan
India, Mexico, Russia, Japan, Australia, South Africa, New Zealand, Kenya, Ghana and Kazakhstan. Thirty-two countries.
757 rules checked against the published lists, none drifted. The check caught two of mine: Ghana's Farmers' Day is the first Friday of December, not the 4th, and Mexico moves a weekend holiday to the nearest weekday.
China, South Korea and Vietnam are out. Their year hangs off Lunar New Year, which is a new moon rather than a rule. Japan is here without its two equinox days, which the observatory announces. India has the three days fixed by statute.

1.61.031 July 2026

The holidays a country keeps, listed

how many national holidays are in canadanothing9 national holidays
bank holidays in the uknothing8 bank holidays · 1 Jan New Year's Day · 3 Apr Good Friday · …
holidays in torontonothing9 national holidays
No new data. These are the rules the working-day count already skipped, read out.
Counted in the noun you asked in: 8 bank holidays, 11 federal ones.

1.60.031 July 2026

The difference between two clocks, asked for outright

time difference between jerusalem and parisnothingParis is 1 hour behind Jerusalem
what is the time difference between tokyo and londonnothingLondon is 8 hours behind Tokyo
time difference between dc and nycnothingno difference, they keep the same clock
tokyo to london still answers with the clock and puts the gap underneath. Asked this way the two swap lines.

1.59.431 July 2026

The sun does set in Reykjavik

dawn in reykjavik 21jun2026the sun does not set · 64.15° is inside the Arctic circleit never gets dark enough for dawn · 64.15° is too far north for the sun to reach 6° below the horizon
Both old lines were false. sunrise in reykjavik answers 2:55 am on that day, and the Arctic circle begins at 66.56°.
Dawn is measured six degrees further down than sunrise, so it can go unreached where the sun plainly rises and sets.

1.59.331 July 2026

"under" now means under

first prime under 10010197
first prime below 500503499
next prime before 33893,3913,373
last prime after 33893,3733,391 · read as "after", which is the word that names a side
The preposition was matched and thrown away, so only the ordinal decided, and first counted upwards.

1.59.231 July 2026

The country you named counts for every kind of count

how many weekdays in july in the us23 weekdays22 working days
weekdays until christmas in the usin 110 weekdaysin 106 working days
working days between 1 jan 0001 and 1 jan 9999 in the us2,498,376 working days after 5.5sthe same answer in 0.4s
The country was taken off the end of the line and then ignored, so the words vanished from the query and changed nothing. The range form had been reading it all along.

1.59.131 July 2026

Boxing Day exists again in Britain and Canada

what day is 28 dec 2027 in the ukTuesday · a working day in the UKTuesday · Boxing Day, observed in the UK
working days between 24 dec 2027 and 4 jan 2028 in the uk5 working days4 working days
23 dec 2027 + 5 business days in the ukFri, 31 Dec 2027Tue, 4 Jan 2028
Christmas and Boxing Day both wanted the same substitute Monday and only one could have it, so two years in seven Boxing Day shut nothing in Britain or Canada.

1.59.031 July 2026

A base answer pastes back in

1715 in octal echoes 1,715 in base 8, and typing that back was told that a base writes whole numbers. The page was disowning its own printing a moment after doing it.
A comma groups or it is a decimal point, told apart by whether the groups are threes. 1,715 is a number and 1,5 is one and a half.

1.58.031 July 2026

Whether two places keep the same clock

is dc and nyc the same timezone, do dc and nyc share a time zone, is tokyo the same timezone as seoul.
Three answers, not two. Same zone is yes. Different clocks is no, with the gap. Different zones keeping the same clock is neither, and it says which: Tokyo and Seoul agree all year, Phoenix and Los Angeles agree today and part in November.

1.57.031 July 2026

A second opinion on every holiday

The rules are now checked against two published sources instead of one, because they are wrong in different places and a rule both agree with is a rule worth trusting.
It found four things on its first run. Poland made Christmas Eve a non-working day in 2025 and this had not heard. Switzerland keeps four holidays nationwide, not the seven claimed here. The Netherlands was missing Liberation Day and Sweden was missing Midsummer.

1.56.031 July 2026

Nineteen more countries know their holidays

France, Germany, Italy, Spain, the Netherlands, Poland, Portugal, Sweden, Belgium, Austria, Switzerland, Greece, Ireland, Denmark, Norway, Finland, Czechia, Brazil and Argentina.
what day is 14 jul 2026 in paris says Bastille Day. 10 business days in france from now skips what France skips.
Rules rather than dates, and all 483 of them are checked against published lists. Only three countries move a holiday off a weekend, and Argentina moves four of its days to make a long weekend.

1.55.031 July 2026

New Year's Day is a holiday again

The 1st of January had been counting as a working day in all three countries. The lists that say which days shut an office spell it "new years" and the lookup only answered to "newyears", so it quietly matched nothing.
31 dec 2025 + 1 business day in the us gave you the 1st. It gives you the 2nd.
The check that compares these rules against published holiday lists now covers every day, in all three countries, which is how this surfaced.

1.54.031 July 2026

The holiday has a name, and the city keeps its own

what day is 1 jul 2026 in toronto says Canada Day. The place carries its country, so you do not have to add one.
The day off moved off a weekend says so: what day is 3 jul 2026 in new york is Independence Day, observed.
what day is it in quebec said Friday in Toronto. Quebec keeps Toronto's clock and is not Toronto, and the answer no longer renames it.

1.53.031 July 2026

Several numbers, one question

are 4831 and 5 both prime numbers, are 7, 11, 13 prime. The answer says which of them are, since a bare no throws away the half you were asking about.
Commas and spaces both separate, and 4,831 and 5 is two numbers rather than three.

1.52.031 July 2026

Boston is 300 km from New York again

distance from boston to new york answered 0 km. Boston keeps New York's clock, and the distance was reading the clock's position rather than the city's.
The hundred-odd cities that borrow a zone now carry their own coordinates, and the answer names the city you typed rather than the one whose clock it keeps.
Chelyabinsk joins the list in the same pass.

1.51.031 July 2026

The suggestions stop repeating themselves

The chips drew their places from a list of ten, so Singapore and Paris came round every other visit and the suggestion read as a fixed one rather than a generated one.
Ninety-four cities now, which puts a repeat about one draw in four thousand. Barnaul and Vladivostok are in there, along with Tbilisi, Reykjavik and Hobart.

1.50.031 July 2026

The app stops changing width

The column is 720px on every visit. It used to be as wide as whatever happened to be inside it, so a long saved query gave you a wide app and a short one squeezed it under 450px, on the same screen, with nothing you did to explain the difference.
The heading, the box and the footer now line up down one edge. The word calculingo at the top was floating in the middle because the bar holding it was only as wide as the word.

1.49.031 July 2026

The enter key draws itself

The key beside just press enter on the About page carries its own size and colour, so a stylesheet that has not arrived yet costs you a border and nothing else.
Before this it was an 11-pixel arrow that filled the width of the page in solid black whenever the CSS lagged behind the HTML.

1.48.031 July 2026

A new icon, and a keyboard key you can see

The tab icon was a calendar, which stopped being the truth some while ago. It is an equals sign now, drawn rather than borrowed from the emoji set.
The About page shows you how to save a query, with the enter and return keys drawn inline as keys.

1.47.031 July 2026

The chips show the whole of it

The suggestions under the box sat at eight kinds of question while seven more arrived behind them. You were shown a date-and-unit calculator and could have been forgiven for thinking that was all of it.
Fifteen kinds now, twelve of them per load: distances, other calendars, weekdays, bases and Roman numerals, primes and factors, statistics, and the sentences where two things make a third, as well as the eight that were already there.
The unit chip draws on the whole table rather than the corner of it that existed in July: angles, energy, bits and line speeds turn up alongside kilometres and pounds.

1.46.031 July 2026

Percent change

percent change from 120 to 150 is +25%. The three orders already here take a part and a whole; this one takes a before and an after.
Say the direction and the figure drops its sign, so percent increase from 120 to 150 is 25%. Say the wrong direction and the numbers win, with a note saying which way it went.
Two rates sit a number of points apart as well. percentage points from 15% to 20% is +5 points, and a rise of a third on the old rate.

1.43.031 July 2026

Primes, factors and divisibility

is 91 prime answers no, and 7 × 13. You wanted the 7 × 13 more than you wanted the no.
factors of 360 lists the two dozen divisors. prime factors of 360 is 2^3 × 3^2 × 5.
next prime after 100 is 101. is 360 divisible by 8 answers yes and 45; ask it about 100 and you get no and 12 remainder 4.
Above a trillion it declines rather than spend a second dividing while you type.

1.40.031 July 2026

How spread out a list is

stdev of 1 2 3 4, variance of ..., mode of 1 2 2 3. Divided by n-1, and the answer says sample so you can see which divisor it picked.
Ask for the other divisor by name: population stdev of 1 2 3 4.
p90 of ..., q1 of ..., iqr of .... Half a dozen definitions of a percentile disagree on short lists, so the answer names the one it used.
A mode may be two values or none. Where nothing repeats, it says so instead of handing back whichever value came first.

1.37.031 July 2026

Bases, and Roman numerals

255 in hex, 0xff in decimal, 255 in base 7. Any base from 2 to 36.
19 octal in decimal tells you that 9 is not an octal digit.
1994 in roman is MCMXCIV. Type IIII and you get 4, with a note that the proper spelling is IV.
dec and oct stay December and October.

1.34.031 July 2026

Fuel economy

30 mpg in l/100km, 8 l/100km in mpg. Distance over fuel and fuel over distance sit upside down from each other, so no factor turns one into the other.
Which gallon is a fifth of the answer: 30 mpg uk in l/100km. Leave it out and you get the US one, and the answer says so.
500 km at 8 l/100km is forty litres. 500 km on 40 litres is the economy you managed.

1.31.031 July 2026

Bits, line speeds and download times

1 byte in bits, 100 mbit in mb. Decimal and binary bits both.
100 Mbps in MB/s. A capital B is a byte and a small one is a bit, which is what the industry writes and the second place here where the case of a letter changes the answer.
5 GB at 20 Mbps is 33 minutes 20 seconds. The same file at 20 MB/s takes four minutes, and that eight is why anybody ever cared about the difference.
5 GB in 10 minutes is the rate a line would have to be.

1.28.031 July 2026

Energy

100 kcal in kj, 1 kwh in joules, 1 btu in j, 1 therm in kwh. A kettle is rated in watts and billed in kilowatt-hours, and neither used to reach the other.
250 Calories is a thousand times 250 calories. A food label's capital C is the whole of the difference.
100 w for 3 hours is 0.3 kwh. 1 kwh at 100 w is the ten hours your battery lasts.

1.25.031 July 2026

Angles

90 degrees in radians, 1 turn in degrees, 200 grad in degrees. The sums have answered trigonometry in radians since they were written, which left you holding a unit you had not asked for.
Arcminutes and arcseconds come with it, and 90° in radians reads the sign.
40°42'46" in decimal degrees, and back the other way with 40.7128 degrees in dms. 5'10" in cm is still a height: the degree sign tells the two apart.

1.22.031 July 2026

Lakh and crore

2 crore rupees in usd, 5 lakh inr in usd, half a crore, 2 lakh km in miles.
1 crore answers 1,00,00,000, grouped in twos the way you say the word, with 10,000,000 underneath. Rupee amounts get the same grouping.
1 crore in lakhs is 100 lakh. 1 thousand is a thousand, where it used to be the year 1000.

1.19.031 July 2026

Holiday names finish themselves

Type next ram and adan appears in grey. days until chris finishes as christmas, hanu as hanukkah.
Nothing about those spellings is guessable from outside, and the page never shows you the list. Same argument as the city completion.
A city still comes first, so st p is Saint Petersburg. It leaves a whole word alone, so eid stays eid.

1.18.031 July 2026

The same day in another calendar

today in the hebrew calendar, hijri date, christmas in the islamic calendar, thai date. Ten calendars, all of them your browser's own.
Each answer says where that calendar's year count starts, since that is the one thing about a strange year number worth knowing.
1 muharram 1448 reads back the other way, which is how you type a date off a printed invitation.
The Chinese calendar is missing, for the reason Lunar New Year is: the runtime's answer runs a day out when a new moon falls near midnight in China.

1.15.031 July 2026

Which day of the week

what day of the week is 4 jul 2026, what day is christmas, christmas falls on what day, what day is it.
what day is 25 dec 2026 in the us says it is a holiday there. Name no country and you get weekday or weekend, since without one there is no telling who is at work.
what day is it in tokyo reads the date off the clock there. Los Angeles is sometimes still on the day before.

1.12.031 July 2026

How far apart two places are

distance from tokyo to london, how far is tokyo from london, distance tokyo london, how far is tokyo.
It reads the coordinates sunrise already uses, so it ships no new data to answer you.
Name the unit at either end: distance from tokyo to london in miles, how many km from tokyo to london.
The detail line carries the bearing the course sets off on, which is why a long flight looks bent on a flat map.

1.9.030 July 2026

Weights of things you cook with

200g flour in cups, 2 cups flour in g, 1 cup butter in g. Two dozen ingredients, in grams per US cup.
A cup of flour is not a fixed quantity of flour, so the answer says the figure is nominal.

1.8.030 July 2026

A rate on a past day

100 usd in eur on 1 jan 2020. The ECB has published a daily series since 1999 and the proxy will fetch a day of it.
It publishes on business days, so a weekend or a holiday answers with the last day it did publish. The answer says which day it used, because a rate is data with an age.

1.7.030 July 2026

Every

every friday in august, every 2nd tuesday until december, every last friday in 2027. You get the count and the dates.
every 5th tuesday in 2027 names the four months that have one.

1.6.030 July 2026

The length of an afternoon

hours between 9am and 5pm, minutes between 9am and 5:30pm. An end before its start is the next day, so hours between 10pm and 6am is a night shift of eight.
Each end may name its own zone. hours between 9am london and 5pm tokyo answers nought, the two desks being at the same instant.

1.5.030 July 2026

Working days that know where the office is

Name a country and the count skips its holidays as well as its weekends: 1jul2026 + 5 business days in the us steps over the 3rd, because the 4th falls on a Saturday that year.
Britain and Canada add a substitute day after a holiday that lands on a weekend, so Christmas 2026 shuts them the Monday after Boxing Day and shuts the States on the Friday before.
Ranges take a country too: business days between 20dec2026 and 5jan2027 in the uk.
Four bank holidays that had no other name are now dates in their own right: early May, spring bank, summer bank and Victoria Day.

1.4.030 July 2026

Thirty-seven ways of asking that did not work

Amounts in the size you say them: 3 mil rub in dollars, half a million, 10 grand, a dozen.
Currencies by their plain name: rubles, yuan, zlotys. Hundredths too: 50c in usd, 1 gbp in pence.
Money that no longer exists, at the rate fixed when it went: 100 dem in eur, 1000 rur in rub.
Questions put the way you would say them: convert 100 usd to eur, how many miles is 20 km, 100 usd = eur.
Time zones by acronym and by offset: 3pm EST to CET, 3pm utc+2 in tokyo, meeting at 9am pst in berlin.
Sunrise, sunset and twilight anywhere: sunrise in tokyo tomorrow, day length in london.
Area, pressure, power, light-years and teaspoons. Heights in two units at once: 5ft10 in cm, 180 cm in ft in.
Weekends, quarters, ISO week numbers, the nth day of a year, ages from a birth date, and whether a year is a leap year.
The lunar holidays. Your browser already carries the Islamic and Hebrew calendars, so no shipped table can run out.
Unix time, read and written. Fractions, decimals and percentages of one another. Combinations, gcd, and averages of a list.

1.3.028 July 2026

Fewer round trips, and the licence written down

Calculingo serves its own font. Google no longer sees your visit, and each font file carries the hash of its own bytes in its URL.
Your browser keeps calc.js and calc.css for a year and re-fetches only the page that names them, so a second visit downloads little.
Cloudflare sends the Content-Security-Policy as a header, so it covers the page from the first byte.
Both served files state their licence and who owns them.
A line above the box tells you what the app is for. It fades after three seconds.

1.2.027 July 2026

More words it knows, and a currency list you can search

The Easter cycle, the statutory days, this, and the nth weekday of a month.
Arrow through the currency list, preview a choice in the line, take it with Enter or Tab.
Fortnights, ISO weeks, month spans and data sizes. Hours and minutes can drive the count.
A time answer names the place you typed and the date it lands on.
A half-typed query stays quiet.

1.1.026 July 2026

First round of fixes

what time is it in tokyo answers, the same as time in tokyo.
Type three letters of a city and the rest fills in.
A second feed covers the currencies the ECB dropped, the rouble among them.
3 hours counts hours, and from anchors an offset to a date.

1.0.025 July 2026

First release

A date calculator you type at in plain words. It reads dates in whatever shape they arrive and measures the gap between them.
Four grammars share the box: dates, time zones, units and money. Each stays quiet unless the query is its own.
A history list keeps what you asked. Click an answer to copy it.