Converters
Units of every kind, in both directions. 20 free tools, all running in your browser.
Unit converter
Length, weight, temperature, volume, area, speed and data.
Roman numeral converter
Numbers to Roman numerals and back.
cm to inches
Centimetres to inches and feet, and back.
kg to lb
Kilograms to pounds and back.
Celsius to Fahrenheit
°C to °F and back, with a quick table.
Number base converter
Binary, octal, decimal and hexadecimal.
Meters to feet
Metres to feet and inches, and back.
Kilometres to miles
Kilometres to miles and back, with race distances.
Litres to gallons
Litres to US or imperial gallons, and back.
mph to km/h
Miles per hour to kilometres per hour and back.
Ounces to grams
Ounces to grams and back, for cooking.
Square metres to square feet
m² to ft² and back, for rooms and homes.
psi to bar
Tyre and pressure units: psi, bar, kPa.
kW to hp
Kilowatts to horsepower and back.
kcal to kJ
Food energy: kilocalories to kilojoules.
mm to inches
Millimetres to inches and fractions of an inch.
Yards to metres
Yards to metres and back.
Stone to kg
Stones and pounds to kilograms.
MB to GB
Megabytes, gigabytes and terabytes, decimal and binary.
Acres to hectares
Acres to hectares and square metres.
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