Convert length, weight, temperature, area, volume, and speed between metric and imperial units instantly.
Students, travellers, cooks, and engineers converting everyday measurements.
Pick a category
Choose length, weight, temperature, area, volume, or speed.
Select units
Choose the unit to convert from and the unit to convert to. Use the swap button to reverse them.
Enter a value
Type the value and read the converted result instantly.
Switching between metric and imperial units by memory is unreliable. This converter uses precise SI conversion factors across six measurement categories plus temperature, so results are accurate every time.
Travel
Convert miles to kilometres or Fahrenheit to Celsius while abroad.
Cooking
Switch recipe measurements between cups, millilitres, and grams.
Study & work
Convert engineering and science units accurately for homework or reports.
Conversions use standard SI factors and are accurate to six decimal places.
Yes. Temperature uses proper offset formulas (not simple ratios) for Celsius, Fahrenheit, and Kelvin.
Yes, completely free with no limits, and it runs entirely in your browser.