Unit Converter
Convert between units of length, mass, temperature, area, volume, speed, time, digital data, power, energy, pressure and fuel economy — live, in your browser.
Pick a category, type a value, read it in any other unit — instantly and locally.
Each category converts through a single base unit: the value is normalised to the base (metre, kilogram, litre, second, byte, watt, joule, pascal…) and then expressed in the target unit. Temperature and fuel economy are the exceptions — temperature converts with offsets, and fuel economy (L/100km ↔ mpg) is reciprocal — so both are handled separately.
Everything is computed in your browser with plain arithmetic and nothing is sent anywhere. Digital data covers both decimal (KB = 1000 B) and binary (KiB = 1024 B) units — which is exactly where most "why doesn't my disk size match?" confusion comes from.
Power includes both mechanical horsepower (hp ≈ 745.7 W) and metric horsepower (PS, also called cv or ch ≈ 735.5 W) — they differ by about 1.4%, so a car rated in kW reads slightly differently in each.