Free online unit converter
Convert between units across 13 categories — length, weight, temperature, area, volume, speed, data and more — with instant, accurate results. It runs entirely in your browser and works offline, with no ads in the way.
How to convert units
- Choose a category (length, weight, temperature, etc.).
- Enter a value and pick the ‘from’ and ‘to’ units.
- Read the converted result instantly.
- Use the swap button to reverse the conversion.
Accurate by design
The converter uses precise SI conversion factors, and handles the proper Celsius/Fahrenheit/Kelvin formulas for temperature (which isn't a simple ratio). Data sizes use correct binary factors.
Common conversions
- Miles ↔ kilometres, kg ↔ lb.
- °C ↔ °F for cooking and weather.
- MB, GB, MiB for files and data.
- Cups, grams and ml for recipes.