Unit converter
Choose a category, enter a value, and read the result in every unit of that category. Temperature has its own converter.
How the numbers are worked out
Each unit is stored as a factor relative to the SI base unit of its category (metre, kilogram, litre, square metre, metre per second, pascal, joule, second, byte). A conversion multiplies the value by the source factor and divides by the target factor. The factors for the inch (0.0254 m), pound (0.45359237 kg), and the other international customary units are exact by definition; the US gallon is defined as 231 cubic inches, which gives 3.785411784 litres. Standard atmosphere (101,325 Pa) and the calorie (4.184 J, the thermochemical calorie) are conventions, and the nautical mile is 1,852 m by international agreement. Data units use decimal prefixes (1 kB = 1,000 bytes) alongside the binary ones (1 KiB = 1,024 bytes). Results show up to eight significant digits.