Unit Converters

Length, weight, temperature, data and more, with every common unit. 10 free tools, no account needed.

Length Converter

Convert any length between metric and imperial units, from millimeters to miles, and see every unit side by side.

Convert any temperature between Celsius, Fahrenheit, Kelvin and Rankine, with the formulas and a handy reference chart.

Convert between kilograms, pounds, ounces, grams, stone and tons, and see the same weight in every unit at once.

Convert floor and land areas between square meters, square feet, acres, hectares and other units in one step.

Convert between bits, bytes, kilobytes, megabytes, gigabytes and terabytes, in both decimal (GB) and binary (GiB) units.

Convert energy units for food, electricity, heating and science, including kcal, kJ, kWh, joules and BTU.

Convert pressure readings between PSI, bar, kilopascals, pascals, atmospheres and millimeters of mercury.

Convert speeds between km/h, mph, m/s, knots and ft/s for driving, running, weather, flying and physics.

Convert any length of time between milliseconds, seconds, minutes, hours, days, weeks, months and years.

Convert liquid volumes between metric units, US customary units and UK gallons, from teaspoons to cubic meters.