Unit Converter

Pick what you are converting, type a value and choose the units; the answer updates as you type. Details shows the value in every other unit of the same kind.

Every unit is defined by its exact size in the metric base unit (a foot is exactly 0.3048 m, a pound exactly 0.45359237 kg, a US gallon exactly 3.785411784 L), so conversions are exact before rounding. Temperatures use the formulas instead, since their scales do not start at the same zero. Answers show up to 7 significant figures, and Details shows 12.

US and UK volumes differ, so both are listed. A month is the average Gregorian month (30.436875 days) and a year the average Gregorian year (365.2425 days). Kilocalories are the Calories on food labels. Kilobytes and megabytes are powers of 1,000; kibibytes and mebibytes are powers of 1,024.

Your last conversion, the units you chose for each kind and your recent conversions are saved on this device only. Clear all empties them, and Undo brings them back.