Unit Converter
Enter a value once and see it converted to every common unit in that category, instantly.
Value
Convert between every common unit at once
Pick a category — length, weight, temperature, or volume — enter a value, and choose its starting unit. Every other unit in that category updates instantly, so there's no need to pick a "to" unit first: just read off whichever conversion you need.
Also useful: Unix Timestamp Converter and Word Counter.
Frequently asked questions
Conversions use standard, internationally recognized conversion factors (e.g. exactly 2.54 cm per inch) and round the display to a reasonable number of decimal places for readability.
Length, weight, and volume are simple multiplicative conversions, but Celsius, Fahrenheit, and Kelvin each have different zero points, so temperature conversion uses its own formula rather than a single multiplier.
Yes — every unit in a category converts to every other unit in that category simultaneously, so switching your starting unit between metric and imperial just changes which field you type into.