Unit Converters

Convert length, weight, temperature, area, volume, speed, data storage, pressure, energy, power and time with precise, instant conversions.

11 free tools

Convert between metres, kilometres, centimetres, millimetres, miles, yards, feet, inches and nautical miles.

Convert mass between kilograms, grams, milligrams, tonnes, pounds, ounces, stones and US/UK tons.

Convert between Celsius, Fahrenheit, Kelvin and Rankine — with absolute-zero validation.

Convert square metres, square feet, acres, hectares, square miles, square kilometres and more.

Convert litres, millilitres, cubic metres, US and UK gallons, quarts, pints, cups, fluid ounces and spoons.

Convert km/h, mph, m/s, knots, ft/s and Mach.

Data storage converter: convert bits and bytes to KB, MB, GB, TB and PB in decimal (SI) and binary (KiB, MiB, GiB) units.

Convert pascals, kilopascals, bar, millibar, psi, atmospheres, mmHg (torr) and inHg.

Convert joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts and therms.

Convert watts, kilowatts, megawatts, horsepower (mechanical and metric), BTU/h and kcal/h.

Convert nanoseconds to centuries — seconds, minutes, hours, days, weeks, months and years.

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