How to use the Unit Converter
- Pick the type of measurement: length, weight, temperature and so on.
- Enter a value and choose the units to convert from and to.
- Read the result, plus the value in every other unit.
What does this tool do?
This all-in-one converter covers nine kinds of measurement and more than 80 units, from millimeters to nautical miles and from teaspoons to cubic feet.
Factors are based on the international definitions adopted in 1959 and the SI system, so conversions like inches to centimeters are exact, not approximations.
Why use it?
- Everything in one place, no ads between steps.
- Separate US and UK units where they differ.
- Full-precision results you can copy.
Handy conversions to remember
A few exact or near-exact relationships:
| From | To | Factor |
|---|---|---|
| 1 inch | centimeters | 2.54 (exact) |
| 1 mile | kilometers | 1.609344 (exact) |
| 1 kilogram | pounds | 2.20462 |
| 1 US gallon | liters | 3.785411784 (exact) |
| 0 °C | °F | 32 |
| 1 kWh | BTU | 3,412.14 |
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Frequently asked questions
Which countries use imperial units?
The US uses US customary units for most everyday measurements. The UK uses a mix — miles and pints alongside metric. Almost every other country uses metric.
Are US and UK gallons the same?
No. A US gallon is 3.785 liters; a UK (imperial) gallon is 4.546 liters, about 20% larger.
Last reviewed by the M2Toolkit team.