Convert length, weight, temperature, volume, area, and speed between metric and imperial units instantly. Free and accurate.
Last updated 23 June 2026 · Built and maintained by Mustafa Bilgic
Convert between metric and imperial units across six categories: length, weight, temperature, volume, area, and speed. Enter a value, pick your units, and the result appears instantly. Every conversion uses exact, internationally defined factors.
| From | To | Factor |
|---|---|---|
| 1 inch | centimetres | 2.54 |
| 1 mile | kilometres | 1.609344 |
| 1 kilogram | pounds | 2.20462 |
| 0 Celsius | Fahrenheit | 32 |
| 1 US gallon | litres | 3.78541 |
The converter handles length, weight (mass), temperature, volume, area, and speed, covering the most common everyday and engineering conversions.
Conversions use exact, internationally defined factors (for example, 1 inch equals exactly 2.54 cm), so results are precise to many decimal places.
Temperature is not a simple multiplication. Celsius, Fahrenheit, and Kelvin each use offset formulas, which the tool applies correctly behind the scenes.
Yes. You can convert in any direction within a category, including metric-to-metric and imperial-to-imperial, not only metric-to-imperial.
Yes, completely free with no sign-up. All math runs in your browser, so it works instantly and keeps your data private.