Free Unit Converters
21 Free Tools
Convert between metric, imperial and US units with exact factors, such as 1 inch = 2.54 cm and 1 lb = 0.45359237 kg. Pick a converter, type a number and see the answer straight away. Popular pairs such as cm to inches, kg to lbs and Celsius to Fahrenheit have their own pages with a ready-made table.
Length ConverterConvert length and distance: millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.Weight ConverterConvert weight: grams, kilograms, pounds, ounces, stones, tonnes — plus carats, tolas and troy ounces for gold.Temperature ConverterConvert temperatures between Celsius, Fahrenheit, Kelvin and Rankine, with the formula shown.Area ConverterConvert area: square metres, square feet, acres, hectares, square kilometres, square miles and more.Volume ConverterConvert volume: litres, millilitres, US and UK gallons, cups, fluid ounces, cubic metres and more.Speed ConverterConvert speed between km/h, mph, metres per second, knots, feet per second and Mach.Time ConverterConvert time units: seconds, minutes, hours, days, weeks, months and years — down to nanoseconds.Data Storage ConverterConvert data sizes: bytes, kilobytes, megabytes, gigabytes, terabytes — and the binary KiB, MiB, GiB.Pressure ConverterConvert pressure: bar, psi, pascals, kilopascals, atmospheres and mmHg — for tyres, weather and engineering.Energy ConverterConvert energy: joules, calories, kilocalories, kilowatt-hours, BTU and more.Power ConverterConvert power: watts, kilowatts, horsepower, BTU per hour and tons of refrigeration (air conditioners).Force ConverterConvert force between newtons, kilonewtons, pound-force, kilogram-force and dynes.Frequency ConverterConvert frequency: hertz, kilohertz, megahertz, gigahertz, rpm and radians per second.Angle ConverterConvert angles between degrees, radians, gradians, arcminutes, arcseconds and turns.Fuel Economy ConverterConvert fuel economy between L/100 km, km per litre and miles per gallon (US and UK).CM to InchesConvert centimetres to inches (and inches to cm). 1 inch = 2.54 cm exactly. Handy table for heights and screen sizes.KG to LBSConvert kilograms to pounds (and lbs to kg). 1 kg = 2.20462 lb. Quick table for body weight and luggage.MM to InchesConvert millimetres to inches (and inches to mm). 1 inch = 25.4 mm exactly. Table for tools, screws and paper.Meters to FeetConvert metres to feet (and feet to metres), including feet and inches. 1 m = 3.28084 ft.KM to MilesConvert kilometres to miles (and miles to km). 1 km = 0.621371 miles. Includes 5K, 10K, half and full marathon.Celsius to FahrenheitConvert Celsius to Fahrenheit (and °F to °C) with the formula and a table of common temperatures.
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