Unit converter
Ten categories of unit in one converter, with the six most useful alternatives shown alongside every result so you can sanity-check the answer without running a second conversion.
How to use the unit converter
- Pick a category.
- Choose the unit you are converting from and the one you want.
- Type a value — the result and the comparison list update instantly.
How it works
Every category except temperature converts through a base unit: metres for length, kilograms for weight, litres for volume. The value is multiplied by the source factor and divided by the target factor, which keeps the arithmetic exact for any pair in the list.
Temperature is handled separately because its scales have different zero points. Celsius to Fahrenheit is C × 9/5 + 32, and Kelvin is Celsius plus 273.15, so a simple ratio would give the wrong answer.
Common questions
How many kilometres is a mile?
1.609344 km exactly, by international agreement since 1959.
Why are US and UK gallons different?
They are separate historical standards. A US gallon is 3.785 litres and an imperial gallon is 4.546 litres — both are listed separately here.
Is a KB 1,000 or 1,024 bytes?
Both conventions exist. Storage manufacturers use 1,000 (KB) and operating systems often use 1,024 (KiB); both are in the digital storage list.