Unit Converters
Length, weight, temperature and more, using exact international definitions.
Angle ConverterConvert angles between degrees, radians, gradians, arcminutes, arcseconds and turns. A full circle is 360°, 2π rad, 400 grad or 1 turn.Area ConverterConvert area between square millimeters, meters, hectares, acres, square feet, yards and miles using exact international definitions, with the factor shown.Blood Sugar Converter (mg/dL to mmol/L)Convert blood glucose between mg/dL and mmol/L with the exact 18.0182 factor. See a reference table of common values. General reference, not a diagnosis.Clothing Size ConverterConvert women's, men's shirt, and trouser sizes between US, UK, EU, and international S-M-L, with the published body measurements behind each size.Cooking Measurement ConverterConvert cooking volumes between US teaspoons, tablespoons, cups, pints, quarts, gallons, milliliters, liters and metric spoons. Volume only, not weight.Data Storage ConverterConvert data storage between bits, bytes, decimal units (KB/MB/GB/TB) and binary units (KiB/MiB/GiB/TiB), explaining why drives 'lose' capacity.Energy ConverterConvert energy between joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU using exact defined constants.Fuel Economy ConverterConvert fuel economy between mpg (US), mpg (Imperial/UK), km/L and L/100km. Handles the reciprocal relationship of L/100km correctly in both directions.Height ConverterConvert height from centimeters to feet and inches, or from feet and inches to centimeters, using the exact definition that 1 inch equals 2.54 centimeters.Length ConverterConvert between mm, cm, meters, km, inches, feet, yards and miles using exact international definitions. Conversion factor shown for every pair.Number to Words ConverterConvert any number up to 999,999,999,999 into written English words, or into cheque format like 'One thousand two hundred and 34/100 dollars.'Power ConverterConvert power between watts, kilowatts, megawatts, mechanical horsepower, metric horsepower and BTU per hour, with both horsepower units clearly labeled.Pressure ConverterConvert pressure between pascals, kilopascals, bar, psi, standard atmospheres, mmHg (torr) and inHg using exact defined constants.Ring Size ConverterConvert ring sizes between US/Canada, UK/Australia, EU/ISO, and Japan, or look up a size from a measured inside diameter or circumference.Shoe Size ConverterConvert shoe sizes between US Men's, US Women's, UK, EU and CM (Mondopoint), or look up a size from foot length. Brands vary, so measure foot length too.Speed ConverterConvert speed between meters per second, km/h, mph, knots and feet per second using exact definitions, including the mph-to-km/h and knot-to-km/h ratios.Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin with the exact affine formulas, not simple multipliers. See worked steps and the floor at absolute zero.Time ConverterConvert time between seconds, minutes, hours, days, weeks, months and years using calendar-average Gregorian definitions, stated explicitly.Volume ConverterConvert volume between liters, US customary units (cups, tablespoons, gallons) and imperial UK units (pints, gallons) using exact, clearly labeled units.Weight ConverterConvert weight between milligrams, grams, kilograms, tonnes, ounces, pounds and stone using exact international definitions, with the factor for every pair.