# Unit Converters

Six free unit converters that run entirely in your browser. Metric and imperial lengths, weights, temperatures, volumes, speeds and data sizes, using exact conversion factors.

## The converters

- [**Length Converter**Metric and imperial lengths, both directions.](/length-converter/)
- [**Weight Converter**Milligrams to stone, metric and imperial.](/weight-converter/)
- [**Temperature Converter**Celsius, Fahrenheit and Kelvin with formulas.](/temperature-converter/)
- [**Volume, Speed and Data Converter**Volume, speed and data size in tabbed converters.](/volume-speed-data-converter/)

## Frequently asked questions

### Which converters are included?

Length (mm to miles), weight (mg to stone), temperature (Celsius, Fahrenheit, Kelvin), volume (ml to gallons), speed (m/s to knots) and data (bits to terabytes).

### How accurate are the conversions?

All conversions use exact defined factors, like 1 inch = 2.54 cm exactly and 1 pound = 0.45359237 kg exactly. Results are shown with up to 8 significant digits.

### Do the converters work offline?

Yes. Everything is computed locally in your browser with no server calls, so the converters work offline once the page loads.

### Are these converters free?

Yes, all free with no account and no limits.