Convert length, mass, area, volume, temperature, speed, time, data size, pressure and energy — 98 units with exact factors and a full table.
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Factors are exact definitions (1 inch = 0.0254 m, 1 pound = 0.45359237 kg). Month and year use the average calendar length (30.44 and 365.25 days). KB, MB, GB in this tool mean 1024 bytes each, as your operating system shows them; KiB, MiB and GiB are the same value under their exact names. Mach is not offered because it depends on air temperature and altitude, so it has no fixed factor.
Pick a category, type a value and the converter shows the result in the unit you choose - and at the same time in every other unit of that category. Ten categories are covered: length, mass, area, volume, temperature, speed, time, data size, pressure and energy. The factors are the exact legal definitions, not rounded approximations: one inch is 0.0254 metres, one pound is 0.45359237 kilograms, one nautical mile is 1852 metres and one calorie is 4.184 joules. Temperature is the one category that is not a simple multiplication: the three scales have different zero points, so the converter first moves the value to Celsius and then to the target scale. That is why 0 degrees Celsius is 32 Fahrenheit, 100 Celsius is 212 Fahrenheit and minus 40 is the same in both. Results show six significant digits - more precision than everyday use needs. Everything is calculated in your browser.