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Unit Converter

Metric, US and UK units, converted instantly.

All conversions

About this unit converter

This converter uses exact international definitions: one inch is exactly 25.4 millimetres and one pound is exactly 0.45359237 kilograms. US and UK units are listed separately because they differ. A US gallon is about 3.785 litres while a UK gallon is about 4.546 litres, and a US pint is 473 ml against 568 ml for a UK pint. Data units use decimal prefixes, so one kilobyte is 1,000 bytes.

How to use it

  1. Choose a category.
  2. Enter a value and choose the from and to units.
  3. See the result and every other unit in the list.

Frequently asked questions

Why do US and UK gallons differ?

They come from different historical definitions. The UK imperial gallon is about 20% larger.

How is temperature converted?

Using formulas, not multipliers: F = C x 9/5 + 32 and K = C + 273.15.