Unit Converters
Inches to centimetres, pounds to kilograms, Fahrenheit to Celsius: convert between metric and imperial units in one step.
- Unit ConverterChoose what to convert and enter a value to see it in every unit at once.
- Length ConverterEnter a value and pick the units to convert between inches, centimetres, feet, metres, miles and kilometres.
- Weight ConverterEnter a value and pick the units to convert between kilograms, pounds, ounces and grams.
- Temperature ConverterEnter a temperature to see it in Celsius, Fahrenheit and Kelvin.
- Area Unit ConverterEnter a value to convert between square metres, square feet, acres and hectares.
- Volume Unit ConverterEnter a value to convert between litres, gallons, millilitres and cups.
- Speed ConverterEnter a speed to convert between km/h, mph, metres per second and knots.
- Data Size ConverterEnter a value to convert between megabytes, gigabytes, terabytes and bytes.
How do you convert between metric and imperial units?
Conversions between metric and imperial units use fixed, internationally defined factors: an inch is exactly 2.54 cm, a pound 0.45359237 kg and a mile 1,609.344 m.
The unit converter brings seven kinds of measurement onto one screen; the length, weight, area and volume converters show every unit of that kind at once.
Unit ConverterLength ConverterWeight ConverterArea Unit ConverterVolume Unit Converter
Why are temperature, speed and data size converted differently?
Temperature conversion shifts the zero point as well as scaling: water freezes at 0 °C but 32 °F. Data size has two systems, decimal (GB) and binary (GiB).
The temperature, speed and data size converters handle these differences — for example why a 1 TB drive shows as 931 GiB.
Frequently Asked Questions
Are US and UK gallons the same?
No. A US gallon is 3.785 litres and a UK gallon 4.546 litres; the volume converter lists both.
How precise are the results?
Factors come from the official definitions and results show up to eight significant digits.