Unit Converter
Calculators · Done in 3 steps
- 1Pick a category
- 2
- 3
About
Convert length, weight, temperature, area, volume, speed, time and data units with exact factors, the formula shown and every unit listed at once.
How to use it
- 1Pick a category such as Length or Temperature.
- 2Enter a value and choose the from and to units.
- 3Read the result and the formula used; swap units with one click.
- 4See the same value in every other unit of the category.
- You give
- A number and two units
- You get
- Converted value, formula, and a full table of units
- Good to know
- Results show up to 10 significant digits. US and UK volume units differ; months and years use average Gregorian lengths. Every input is saved in the page URL, so you can bookmark or share a result.
- Privacy
- Processed on your device. Nothing is uploaded, stored or logged.
- Last tested
- 2026-10-28
FAQ
Are the conversion factors exact?
Yes, where definitions are exact: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 US gallon = 3.785411784 litres. Results are rounded only for display.
Why is temperature different?
Celsius, Fahrenheit and Kelvin have different zero points, so they need an offset as well as a scale factor (°F = °C × 9/5 + 32).
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