Unit Converter
Six measurement families, exact conversion factors, instant results.
How it works
Every conversion uses internationally agreed exact factors where they exist. For example, one inch is defined as exactly 25.4 mm and one pound is exactly 0.45359237 kg. Temperature is the exception: the scales don’t share a zero point, so it’s converted properly through offsets rather than simple multiplication. Data sizes offer both decimal units (KB, MB, GB: powers of 1,000, as drive manufacturers count) and binary units (KiB, MiB, GiB: powers of 1,024, as your operating system usually reports).
FAQ
Why do file sizes not match drive labels?
Drive makers use decimal gigabytes (1 GB = 10⁹ bytes) while operating systems traditionally report binary gibibytes (1 GiB = 2³⁰ bytes). A “500 GB” drive shows as about 465 GiB. Both are correct, just different units. This converter offers both families.
Is there a difference between US and UK gallons?
Yes. A US gallon is 3.785 liters, a UK (imperial) gallon is 4.546 liters, roughly 20% larger. Both are included; check the label.
How accurate are the results?
Results are computed in full double precision and displayed to six decimal places. For everyday purposes (cooking, travel, workouts) they’re exact for any practical need.