Convert length, weight, volume, temperature, area, speed, data and time — instantly.
This converter covers the units that come up most — kilometres and miles, kilograms and pounds, litres and gallons, Celsius and Fahrenheit — across eight categories. Everything is calculated locally as you type, so it's instant and works offline once the page has loaded. A note on the "data" category: it uses binary sizes (1 kilobyte = 1024 bytes), which is how operating systems usually report file sizes. For kitchen-specific measures and ingredient weights, the cooking conversions page is purpose-built; for mental shortcuts, see mental math.