Super Fun Calculator
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Speed, distance and time in every unit you can think of, and plenty you can’t. Enter any two; it finds the third.
About How to use it Unit converter Unit guide Install the app Sharing Credits About
Speed is distance divided by time, so knowing any two gives you the third. This calculator does that across a ridiculous range of units: from the Planck length (the smallest length physics can talk about) and picoseconds, through feet, furlongs and fortnights, up to light-years and the galactic year, the 230 million years the Sun takes to go round the Milky Way.
It’s handy for a physics problem or a quick conversion, and better for curiosity. How long would a garden snail take to reach Alpha Centauri? How far does light travel in a nanosecond? How fast is a fingernail growing, in kilometres per hour?
The little icon beside each distance and time unit gives a sense of its scale, from an atom to a galaxy.
How to use it
Convert in plain words: “how many inches in a meter”, “how many fluid ounces in a pint”, “5 km in miles”, “98.6 F to C”, or “how many years in an average human male lifespan”. As well as every unit the calculator has, this knows everyday volumes, weights and temperatures.Volumes and masses: ask about all sorts of things: “how many gallons in an Olympic pool”, “how much blood does an elephant have”, “how much fresh water is on Earth”, “how many Earths would fit in the Sun”, “how much does a blue whale weigh”, “how many Earth masses is Jupiter”, “how heavy is a hydrogen atom”, “how much does a human brain weigh”. It knows everyday objects, animals, body parts, atoms and particles, lakes and oceans, planets, moons, the Sun and the Milky Way.
Everyday life too: “how many cups of coffee in a gallon”, “how many sticks of butter in a pound”, “how long to drive 300 miles” (at highway speed), “how long to bike 10 miles”, “how long to jog a 5K”, “how many steps in a mile”, “how many football fields in a mile”, “how much does a car weigh”, “how many toilet flushes in an Olympic pool”. Animal, organ and object figures are typical values; real ones vary.Arithmetic: “what is 12 times 31”, “(5 + 3) × 2”, “2 to the power of 10”, “square root of 144”, “15% of 80”, “subtract 5 from 12”. It works with measurements too: “3 miles plus 2 km”, “3 hours plus 20 minutes”, “60 mph times 3 hours” (a distance), “10 km divided by 2 hours” (a speed), “5 meters times 4 meters” (an area), “10 feet squared”. Add “in metres” (or any unit) to choose the answer’s unit, and start with “times 2” or “plus 5” to keep going from the last answer. Dividing by zero, or mixing things that can’t be combined, gets a plain explanation instead of a wrong number.Typos: a slightly misspelled unit (“killogram”, “minuets”, “gallnos”) is recognised when there’s only one thing it could mean.Follow up: after an answer, ask about it: “how many months in a human lifespan”, then “how many days is that?”, “and in seconds?”, or “how far would light go in that time?”. Words like “that” and “this”, or a question with no amount of its own, use the last answer.History: conversions and look-ups from the question box are saved in the history too; the ↻ button asks the question again.Look things up: “how far is the Sun from the Earth”, “how far is Mars from the Sun in miles”, “how long is a human pregnancy”, “how fast is Voyager 1”.Report a wrong answer: under each answer, “Report a wrong answer” lets you say what went wrong (wrong unit or thing, wrong kind of calculation, wrong number, or something else) and add a note. The report holds only the question, the answer it gave and what you write.Help it learn: tick “Send questions it can’t answer” and any question it can’t work out is saved for adding later. Only the question’s words and the time are kept: nothing that identifies you.Areas: square inches, feet, yards, metres, kilometres and miles, acres, hectares, ares, roods, dunams, tsubo, townships and the physicist’s barn; and the areas of everyday things, sports fields, homes and lots, countries, states, parks, oceans and forests, Earth’s whole surface, its land, water and farmland, the planets, moons and the Sun. Try “how many square feet in an acre”, “how many people could stand in Central Park”, “how many Texases fit in Alaska” or “how many football fields in Central Park”.
Every country, every US state and territory, each ocean and continent, and sea ice (Arctic and Antarctic, at their yearly highs and lows) are included: “how big is France”, “how many Englands fit in the US”, “how big is the Arctic sea ice minimum”. “Georgia” on its own is the US state; say “the country of Georgia” for the country.Ask out loud: tap the microphone in the question box and speak (in browsers that support it: Chrome, Edge and Safari, including phones). Tick Read answers aloud to hear every answer in your browser’s own voice, typed or spoken (it switches on by itself the first time you use the microphone, and stays as you leave it). Chrome and Edge send the recording to their maker’s speech service to turn it into text; Safari does this on the device where it can.Ask in plain words: type a question in the box at the top, such as “how fast in mph to go 1 mile in a blink of an eye” or “how long would a snail take to crawl a marathon in days”. It finds the two amounts and their units (any unit the calculator knows, by name), works out which one you want, uses the unit you ask for, and fills in the calculator.Formulas: the Formula list above the boxes swaps the calculator for about 60 everyday formulas in motion, forces, energy and power, electricity, heat, pressure and fluids, waves, sound and light, geometry, money, and health: braking distance, kinetic energy, Ohm’s law, electricity cost, tyre pressure and temperature, diving pressure, loan payments, BMI and more. Fill in every box but one and the empty one is worked out, whichever it is, in any of the units offered; constants like gravity are filled in for you (and can be changed, say to the Moon’s), and some boxes offer typical values to pick from. Links and the history remember the formula and its numbers.
You can also ask formula questions in the question box (“braking distance at 60 mph on wet asphalt”, “monthly payment on a $300,000 loan at 6.5% for 30 years”, “how many watts is 120 volts at 10 amps”); each formula shows example wordings under the list, which you can tap to try.Calculate: type any two of speed, distance and time; the third fills in and is highlighted. Numbers can be huge or tiny: try 3e8 or 0.000001.Units: pick from the list beside each box. Everything recalculates instantly when you change one.Scale icons: beside the distance and time units, an icon shows roughly how big the unit is.History: your last 10 calculations are kept below the calculator. Load one, delete it with the trash icon, share a single entry, or drag entries to reorder them.Light speed: enter a speed at or past the speed of light, in any unit, and a note explains it isn’t possible for anything with mass, and how long light itself takes for that distance. Between 10% and 100% of light speed, a relativity note shows how much slower time runs on board, the traveler’s own trip time, and how short the distance looks to them.Significant digits: the slider sets how many digits answers show.Clear All empties the boxes and the history.Unit converter and Unit guide are further down this menu.
Unit converter
Convert one value into every unit of a kind at once: pick a category and a unit, type a value, and read the whole list.
Unit guide
Every unit the calculator knows, with its size in metres, seconds or metres per second.
Install the app
Fun Calc installs as an app: its own icon on your home screen or desktop, opening full screen without the browser around it, and working offline once you’ve opened it.
Install Fun Calc
Sharing
Press the share button (top right of the screen). It makes a link-preview picture showing your calculation. Add a title if you like (“Snail to Alpha Centauri”), then post to Facebook, copy the link, or send it another way. The share page’s button reopens the calculator with your numbers, units and history.
Credits
Made by Jason Buchheim. Unit definitions follow SI and common conventions; astronomical units use IAU values.
Areas of countries from the mledoze/countries dataset (Open Database License); US state and territory areas from the US Census Bureau (via typed-usa-states); oceans from the CIA World Factbook; sea ice extents are typical recent values from the US National Snow and Ice Data Center and vary from year to year.
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