32 tools
Unit Converter
Convert any unit by typing it in plain words, or open the converter for the family you need.
Type what you want converted the way you would say it — 12 kg to lb, 1 bar in psi, 100 km/h to mph — and the answer appears as you type. Every unit on the site is searchable this way, and the factors come from one shared library, so the same conversion gives the same number whichever page you use. If you would rather see a whole family at once, with every unit side by side, the dedicated converters are listed below.
Everyday units
- ConvertersLength ConverterConvert between metres, centimetres, inches, feet, yards, miles and nine other length units.
- ConvertersMass & Weight ConverterConvert kilograms, grams, tonnes, pounds, ounces, stones and both US and UK tons.
- ConvertersVolume ConverterConvert litres, millilitres, cubic metres, gallons, pints, cups and fluid ounces.
- ConvertersArea ConverterConvert square metres, square feet, hectares, acres and seven other area units.
- ConvertersTemperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine, with the offset handled correctly.
- ConvertersSpeed ConverterConvert km/h, mph, metres per second, feet per second and knots.
- ConvertersTime Duration ConverterConvert seconds, minutes, hours, days, weeks, months and years as durations.
- ConvertersAngle ConverterConvert degrees, radians, gradians, turns, milliradians, arcminutes and arcseconds.
Technical units
- ConvertersPressure ConverterConvert bar, psi, pascal, kPa, MPa, atmospheres, mmHg, torr and metres of water column.
- ConvertersForce ConverterConvert newtons, kilonewtons, kilogram-force, pound-force, tonne-force and dynes.
- ConvertersEnergy ConverterConvert joules, kilojoules, kWh, calories, kilocalories, BTU and therms.
- ConvertersPower ConverterConvert watts, kilowatts, megawatts, horsepower, metric horsepower, BTU/h and tons of refrigeration.
- ConvertersTorque ConverterConvert newton-metres, kilogram-force metres, pound-force feet and pound-force inches.
- ConvertersDensity ConverterConvert kg/m³, g/cm³, kg/L, t/m³, lb/ft³ and lb/in³.
- ConvertersFlow Rate ConverterConvert m³/h, m³/s, L/s, L/min, US gallons per minute and cubic feet per minute.
- ConvertersMass Flow ConverterConvert kg/s, kg/h, t/h, t/day, g/s and pounds per hour.
- ConvertersDynamic Viscosity ConverterConvert pascal seconds, millipascal seconds, centipoise, poise and imperial units.
- ConvertersAcceleration ConverterConvert m/s², g, ft/s², gal and (km/h)/s.
- ConvertersFrequency & Rotation ConverterConvert hertz, kilohertz, megahertz, revolutions per minute and radians per second.
- ConvertersIlluminance ConverterConvert lux, foot-candles, phot and nox.
Digital and numbers
- ConvertersData Storage ConverterConvert bits, bytes, kB, MB, GB, TB and the binary KiB, MiB, GiB and TiB.
- ConvertersData Transfer Rate ConverterConvert Mbps, MB/s, Gbit/s and the other units used for internet and disk speed.
- MathematicsNumber Base ConverterConvert whole numbers between binary, octal, decimal and hexadecimal.
- MathematicsRoman Numeral ConverterWrite any number from 1 to 3999 in Roman numerals.
- ConvertersFuel Economy ConverterConvert L/100 km, km/L, miles per US gallon and miles per imperial gallon.
- Construction & DIYDrawing Scale ConverterTurn a measurement taken off a scale drawing into the real-world size.
Converters for particular jobs
- EverydayCooking Measurement ConverterConvert cooking volumes into grams and ounces for common ingredients.
- EverydayFeet and Inches to CentimetresConvert a height in feet and inches to centimetres, or back again.
- EverydayShoe Size ConverterEuropean, UK, US and Mondopoint shoe sizes from the length of the foot in centimetres.
- EverydayOven Temperature ConverterCelsius, Fahrenheit, gas mark and the fan-oven equivalent, all at once.
- ElectricityAWG to mm² ConverterConvert an American Wire Gauge number into conductor diameter and cross-sectional area.
- Work & ProductivitySalary ConverterTurn an annual salary into monthly, weekly, daily and hourly figures.
Why so many separate converters?
Because a page that does one thing can explain that thing. A length converter can tell you that the international inch has been exactly 25.4 mm since 1959 and that the survey foot was a different length until 2022; a pressure converter can explain why bar and atmosphere are close but not equal. A single box that converts everything cannot say any of that, which is why it is at the top of this page and the explanations are on the pages below.