Unit Converter

How it works

Every conversion here runs through a base unit. For length the base is the meter, for weight the kilogram, for volume the liter and for speed the meter per second: the input is converted into the base unit using an exact definition (a mile is exactly 1.609344 km, a pound is exactly 0.45359237 kg), then converted out into the target unit. Using base units means all 100-plus unit pairs in a category share one consistent table instead of a separate formula per pair, so results can never contradict each other. Temperature is the exception, because its scales have offsets as well as ratios: conversions route through Celsius using C = (F - 32) x 5/9 and K = C + 273.15. Results are shown with up to six significant decimal places, trimmed so everyday answers stay readable. A note on variants: this converter uses United States customary units, so a gallon is the US liquid gallon (3.785 liters), not the larger imperial gallon. For cooking, travel, shipping and science homework these definitions cover the conversions people actually need day to day.