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 ConverterMetric and imperial lengths, both directions.
- Weight ConverterMilligrams to stone, metric and imperial.
- Temperature ConverterCelsius, Fahrenheit and Kelvin with formulas.
- Volume, Speed and Data ConverterVolume, speed and data size in tabbed converters.
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.