Unit Converter
Length, mass, temperature, data, speed & time.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Convert between units across eight measurement families — length, mass, temperature, data, speed, area, volume and time — with precise, instant results.
Frequently asked questions
Is this unit converter accurate?
Yes. Conversions use exact SI definitions (e.g. 1 inch = 25.4 mm exactly) and full double-precision arithmetic, with temperature handled by its proper formula rather than a ratio.
Does it work offline?
Once the page has loaded, every conversion runs in your browser with no network requests — so it keeps working with no connection and nothing you type is ever sent anywhere.