Choose the input and output units, then enter a value. Results update on your device and are rounded for display.
Rounded values for everyday reference. Mass is shown separately from force. US and imperial gallons are distinct. Time units are fixed intervals, not calendar months or years. Currency rates are not supplied.
Unit conventions
A prefix conversion applies to the same underlying linear unit; it is not an area or volume prefix shortcut.
Reference
BIPM SI prefixes. Factors checked 24 October 2026. Use authoritative methods for safety-critical or high-precision work.