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Convert between units and formats.
Length
Convert between miles, kilometres, feet, metres, inches, centimetres, yards and more — exact to the international yard, with a reference table and every unit at once.
Open tool →Weight
Convert pounds, kilograms, ounces, grams, stones, tons, carats and troy ounces, exact to the international pound (0.45359237 kg).
Open tool →Temperature
Convert Celsius, Fahrenheit, Kelvin and Rankine with the formula shown, plus an oven temperature and gas mark chart.
Open tool →Area
Convert acres, hectares, square feet, square metres, square miles and more, with exact factors and a quick-reference table.
Open tool →Volume
Convert litres, US and UK gallons, quarts, pints, cups, fluid ounces, cubic feet and more — US and imperial units kept separate.
Open tool →Speed
Convert mph, km/h, m/s, knots and feet per second, with the exact factor and a conversion table.
Open tool →Time
Convert between nanoseconds, seconds, minutes, hours, days, weeks, months and years, using average Gregorian months and years.
Open tool →Pressure
Convert psi, bar, kPa, atm, mmHg, inHg, torr and kgf/cm² — for tyres, weather, gauges and engineering.
Open tool →Energy
Convert joules, calories, kilocalories, kWh, BTU, therms, foot-pounds and electronvolts.
Open tool →Power
Convert watts, kilowatts, horsepower (mechanical, metric and electrical), BTU/h and tons of refrigeration.
Open tool →Frequency
Convert hertz, kHz, MHz, GHz, RPM and radians per second.
Open tool →Force
Convert newtons, kilonewtons, pound-force, kilogram-force, dynes, kips and poundals using standard gravity.
Open tool →Torque
Convert newton-metres, foot-pounds (lbf·ft), inch-pounds, kgf·m and kgf·cm — handy for torque wrench and spec-sheet values.
Open tool →Density
Convert kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³ and pounds per gallon.
Open tool →Angle
Convert degrees, radians, gradians, turns, arcminutes, arcseconds, milliradians and NATO mils.
Open tool →Fuel
Convert mpg (US and UK), L/100 km, km/L and gallons per 100 miles — reciprocal units handled correctly.
Open tool →Cooking
Convert cups, tablespoons, teaspoons, millilitres and fluid ounces — and cups to grams for flour, sugar, butter and 20+ other ingredients.
Open tool →Storage
Convert bits, bytes, KB, MB, GB, TB and PB — decimal (SI) and binary (KiB, MiB, GiB) — and see why a 1 TB drive shows as 931 GB.
Open tool →Bandwidth
Convert Mbps, MB/s, Gbps, kB/s and MiB/s, and work out how long a download or upload takes at that speed.
Open tool →Turn pixels into print size at any DPI, find the pixels a print needs, or work out an image's DPI — with a chart of common photo and paper sizes.
Open tool →Screens
Work out a screen's width, height and area from its diagonal and aspect ratio, plus pixel density (PPI) and pixel pitch from its resolution.
Open tool →Clothing
Convert women's dress sizes between US, UK, EU, French and Italian, and men's suit and shirt collar sizes between US/UK and EU.
Open tool →Shoes
Convert shoe sizes between US men's, US women's, UK, EU, Mondopoint and Japan — or find your size from your foot length. Adults and children.
Open tool →Paper
Every A, B and C paper size, US Letter, Legal, Tabloid, ANSI and architectural sizes, and Japanese B sizes — in mm, inches, points and pixels at any DPI.
Open tool →Bases
Type in binary, octal, decimal, hex or any base from 2 to 36 and see the rest update — including fractions, with repeating digits shown exactly.
Open tool →Roman
Convert numbers to Roman numerals and back (1–3,999), with a place-by-place breakdown and a check for non-standard forms like IIII.
Open tool →Words
Write numbers in English words — cardinal, ordinal or cheque wording, US or UK style, million/billion or lakh/crore — and turn words back into digits.
Open tool →Fractions
Convert decimals to simplified fractions and mixed numbers, fractions to decimals with repeating digits, and find the nearest ruler fraction.
Open tool →Notation
Convert numbers to and from scientific, E and engineering notation, round to significant figures, and count significant figures — exactly, without floating-point error.
Open tool →Formatting
Format a number for any locale — thousands separators, decimal commas, currency, percent, units and compact notation — and get the Intl.NumberFormat code.
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