Unit Converter
Convert length, mass, volume, area, speed, time, and temperature.
How it works
Every unit in a category is stored as a ratio to one base unit — metres, kilograms, litres, and so on. The tool converts your value to that base unit and back out into the target unit, so conversions stay exact. Temperature is handled separately because Celsius, Fahrenheit, and Kelvin have different zero points.
Frequently asked questions
Are the conversion factors exact?
Yes — the imperial-to-metric factors are the internationally defined ones, such as 1 inch = 0.0254 m exactly and 1 pound = 0.45359237 kg exactly. Results are rounded for display only.
Why is temperature treated differently?
Length or mass units scale from a shared zero, so a single multiplication works. Celsius, Fahrenheit, and Kelvin have different zero points, so converting needs an offset as well as a scale factor.
Does it work offline?
The conversion runs entirely in your browser with no server call, so once the page has loaded it keeps working without a connection.
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