Unit Converter
Convert length, weight, temperature, volume, area, speed and data sizes instantly.
How to use Unit Converter
- 01Pick a category such as length or temperature.
- 02Choose the unit you are converting from and the one you want.
- 03Type a value — the conversion updates as you type, in both directions.
About Unit Converter
Conversions use exact internationally agreed factors where they exist: one inch is exactly 25.4 millimetres, one pound is exactly 0.45359237 kilograms, and one mile is exactly 1609.344 metres.
Temperature is the exception, because Celsius and Fahrenheit have different zero points as well as different scales, so the conversion is a formula rather than a single multiplier.
Frequently asked questions
- Which unit categories are supported?
- Length, weight, temperature, volume, area, speed, time and digital storage.
- Are US and UK measures different?
- Yes for volume — a US gallon and pint are smaller than the imperial versions, and both are listed separately.
- How precise are the results?
- Results are shown to a sensible number of significant figures and rounded only for display.
Related tools and tools
Currency Converter
Convert between world currencies using up-to-date exchange rates.
Percentage Calculator
Percent of a number, increase and decrease, and the difference between two values.
Timestamp Converter
Convert between Unix epoch time and readable dates, in seconds or milliseconds.
QR Code Generator
Turn a link, message or contact detail into a QR code you can download and print.