Free Universal Unit Converter
Convert between metric, imperial, and other units across 5 categories — all calculations happen instantly in your browser.
Categories
**Length** — mm, cm, m, km, in, ft, yd, mi
**Weight** — mg, g, kg, tonnes, oz, lb, stones
**Temperature** — Celsius, Fahrenheit, Kelvin
**Speed** — m/s, km/h, mph, knots, ft/s
**Volume** — mL, L, m³, gallons, quarts, pints, fl oz, cups
Quick Reference
| Conversion | Formula |
|-----------|---------|
| °C to °F | (°C × 9/5) + 32 |
| °F to °C | (°F − 32) × 5/9 |
| 1 mile | 1.609 km |
| 1 kg | 2.205 lb |
| 1 gallon | 3.785 L |
| 1 m/s | 3.6 km/h |