Unit converters for everyday measurements, technical units and number systems. Enter a value, choose the units and get the result from exact, published conversion factors where they exist.
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles using exact international factors.
Convert between milligrams, grams, kilograms, ounces, pounds and stones using exact international mass factors.
Convert temperatures between Celsius, Fahrenheit and Kelvin, including oven settings, body temperature and scientific values.
Convert between square meters, square kilometers, square feet, acres and hectares using exact area factors.
Convert between milliliters, liters, cubic meters, fluid ounces, cups, pints and gallons using US customary definitions.
Convert speeds between kilometers per hour, miles per hour, meters per second and knots.
Convert between decimal and binary storage units: bytes, KB, MB, GB, TB and their KiB, MiB, GiB, TiB counterparts.
Convert kitchen measures by volume: teaspoons, tablespoons, cups, milliliters and liters, using US customary sizes.
Convert pressure between pascals, kilopascals, bars, PSI, atmospheres and millimeters of mercury.
Convert energy between joules, calories, watt-hours, kilowatt-hours and British thermal units.
Convert power between watts, kilowatts, megawatts and mechanical horsepower.
Convert force between newtons, kilonewtons, pound-force and kilogram-force.
Convert angles between degrees, radians, gradians and turns for maths, code and drawings.
Convert time between milliseconds, seconds, minutes, hours, days, weeks and years with fixed factors.
Convert fuel economy between L/100 km, km/L, US MPG and imperial MPG, in the right direction each time.
Convert linear acceleration between meters per second squared, feet per second squared and standard gravity.
Convert torque between newton-meters, pound-feet, pound-inches and kilogram-force meters.
Convert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute.
Convert density between kilograms per cubic meter, grams per cubic centimeter and imperial density units.
Convert data rates between bits and bytes per second, from kbps and Mbps to KB/s, MB/s and Gbps.
Convert whole numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36.
Convert whole numbers from 1 to 3,999 to standard Roman numerals and back.
Length, weight, area, volume, speed and temperature converters cover metric, imperial and US customary units for travel, shopping and DIY. The cooking converter turns teaspoons, tablespoons and cups into milliliters, and the temperature converter includes Celsius, Fahrenheit and Kelvin.
Pressure, energy, power, force, torque, acceleration, frequency, density and angle converters support coursework and technical specifications. The fuel economy converter handles L/100 km, km/L and US and imperial MPG, where a higher MPG means a lower L/100 km.
Data storage and transfer rate converters keep decimal units (KB, MB) apart from binary ones (KiB, MiB) and bits apart from bytes. The number base converter works from base 2 to 36, the Roman numeral converter handles 1 to 3,999 in both directions, and the time unit converter uses fixed factors from milliseconds to years.