Convert units
Length, mass, temperature, volume, area, speed, data — with the answer appearing as you type.
Runs on your device
No uploads, ever
Free, no account
How it works
- Pick a category
Seven shelves of units, from millimetres to nautical miles.
- Type the value
Both directions convert live; the factor used is shown for doubters and students.
- Copy the answer
Full precision shown, sensible rounding applied.
Questions people actually ask
Why is Fahrenheit↔Celsius different?
Temperature has an offset, not just a multiplier — 0° doesn't mean 'no temperature'. It's handled correctly, unlike the multiplying-by-1.8 school of conversion.
Data units — 1024 or 1000?
Both shown where it matters: decimal (1000, what drive makers print) and binary (1024, what the file system means). The eternal discrepancy, finally on speaking terms.