Unit Converter

This converter covers 17 unit categories — length, mass, temperature, time, speed, volume, pressure, energy, power, force, frequency, electric charge, digital storage, angle, illuminance, parts-per (percent/ppm/ppb), and pieces (dozen/gross/score) — in one tool instead of a separate page per category. Every category routes through one shared base unit internally (metres for length, kilograms for mass, and so on), so a conversion between any two units in the same category is always exact to floating-point precision, not a chain of lossy intermediate roundings.

Temperature is the one category that isn't a simple multiply — Celsius, Fahrenheit, and Kelvin are related by an offset as well as a scale, which this calculator handles correctly (0°C converts to 32°F and 273.15K, not a proportional scale-up).

Pick a category, then choose the unit you're converting from and to — the result updates as you type, and the swap button flips the two units without re-entering the value. Digital storage includes both decimal prefixes (KB, MB, GB — powers of 1000, as used for network speeds and file sizes on macOS/Linux) and binary prefixes (KiB, MiB, GiB — powers of 1024, as reported by Windows and RAM specifications), since the two are often confused but aren't interchangeable.

1. Choose a unit category from the row of buttons at the top.
2. Enter a value in the "From" field and pick the unit it's currently in.
3. Pick the unit to convert to and read the result — use the swap button to flip direction.