Unit converters

Every converter shows the exact equivalent, a conversion table and a trick for doing it in your head. The two fields are linked, so you can type in either direction.

Pick your units

Length Converter Metres, centimetres, inches, feet, yards and miles, in any combination.
Weight Converter Kilograms, grams, pounds, ounces, stone and tonnes, in any combination.
Temperature Converter Celsius, Fahrenheit, Kelvin and Rankine, in any combination.
Volume Converter Litres, millilitres, cubic metres, gallons, pints and cups, in any combination.
Area Converter Square metres, square feet, hectares and acres, in any combination.
Speed Converter Kilometres per hour, miles per hour, metres per second, knots and feet per second, in any combination.
Pressure Converter Bar, psi, pascals, atmospheres and millimetres of mercury, in any combination.
Energy Converter Joules, kilojoules, calories, kilocalories, watt hours and kilowatt hours, in any combination.
Time Converter Milliseconds, seconds, minutes, hours, days, weeks and years, in any combination.
Angle Converter Degrees, radians, gradians, turns, arcminutes and arcseconds, in any combination.
Flow Rate Converter Litres per second, litres per minute, cubic metres per hour and gallons per minute, in any combination.
Torque Converter Newton metres, kilogram-force metres, pound-feet and pound-inches, in any combination.
Frequency Converter Hertz, kilohertz, megahertz, gigahertz and revolutions per minute, in any combination.
Density Converter Kilograms per cubic metre, grams per cubic centimetre, pounds per cubic foot and the rest, in any combination.
Viscosity Converter Pascal seconds, poise, centipoise and pound-force seconds per square foot, in any combination.
Number to Words Any number written out in words, with the hyphens, the British «and» and the form a cheque needs.
GPS Coordinates Converter Coordinates between decimal degrees, degrees and minutes, and degrees, minutes and seconds.
Lumens, Lux and Candela Lumens, lux and candela, using the beam angle and the distance that link them.
Clothing Size Converter Clothing sizes between Europe, Italy, the UK and the US, worked out from the chest measurement.
Shoe Size Converter Shoe sizes for Europe, the UK, the US and Japan, worked out from the length of the foot.
Ring Size Converter Ring sizes for Spain, Italy, the UK and the US, from the circumference or the diameter.

Unit converters

Pick your units

Straight conversions