Unit converters

Convert between metric and imperial units instantly. Choose a category to convert any pair of units, with conversion tables for common values.

Length Converter

Convert between metric and imperial length units — millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles.

Convert between metric and imperial weight and mass units — milligrams, grams, kilograms, tonnes, ounces, pounds and stones.

Convert between Celsius, Fahrenheit and Kelvin. Temperature is an affine scale, so conversions use both a multiplier and an offset.

Convert between metric and imperial area units — square meters, square kilometers, hectares, acres, square feet, square yards and more.

Convert between metric and imperial volume units — milliliters, liters, cubic meters, gallons, quarts, pints, fluid ounces and cups.

Convert between speed units — meters per second, kilometers per hour, miles per hour, knots and feet per second.

Convert between digital storage units — bits, bytes, kilobytes, megabytes, gigabytes, terabytes and petabytes. Uses binary (1,024) multiples.

Convert between time units — milliseconds, seconds, minutes, hours, days, weeks, months (average) and years (average).