Unit converter
Convert length, weight, temperature, volume, speed and more between metric and imperial — instantly.
Runs 100% in your browserHow to convert units
- Pick a category. Choose length, mass, temperature and so on.
- Choose units. Select the from and to units.
- Type a value. The converted result updates live; click Copy for full precision.
About unit conversion
Most conversions are a single ratio against a base unit — metres for length, grams for mass, litres for volume — so the tool stores one factor per unit and divides. Temperature is the exception: it needs offset formulas, which this converter applies correctly. All arithmetic runs locally in your browser, so there is nothing to upload and it works offline.
Frequently asked questions
- Length, mass/weight, temperature, volume, area, speed, digital storage and time — each with the common metric and imperial units.
- Conversions use exact ratios where they exist (e.g. 1 inch = 25.4 mm) and double-precision arithmetic, with sensible rounding on display. You can copy the full-precision result.
- Temperature is not a simple ratio, so Celsius, Fahrenheit and Kelvin are converted with their proper offset formulas, not multiplication.
- Yes — it is pure client-side math with no network calls, so it keeps working with no connection and uploads nothing.