Unit converter
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Understanding unit conversions
Compare like quantities
Each category converts between units of the same quantity. Length, area and volume are distinct: doubling a length does not simply double the area or volume of a similarly scaled object.
Temperature is different
Celsius, Fahrenheit and Kelvin use different zero points. Temperature conversion needs an offset as well as a scale factor; it is not the same as converting a length or weight.
Check critical calculations
Displayed results are rounded to eight significant digits. Rounding and computer number precision can affect the last digits. Independently verify conversions used for safety-critical work or other decisions that require exact results.