Units and measurement
Units and measurement: 16 free online tools. Compare tasks, read instructions and choose a tool. No account required.
Convert length, weight, temperature, area, volume and other measurements. Select the source and destination units before entering a value. Temperature scales use offsets as well as multipliers, and some practical conversions depend on additional assumptions.
Choose a tool 16
Length converter
Convert metric, imperial and nautical lengths.
Units and measurementWeight converter
Convert common mass units.
Units and measurementTemperature converter
Convert Celsius, Fahrenheit and Kelvin.
Units and measurementArea converter
Convert square units, acres and hectares.
Units and measurementVolume converter
Convert volumes with explicit US and UK definitions.
Units and measurementSpeed converter
Convert speed between metric and imperial units.
Units and measurementData size converter
Compare decimal and binary data units.
Units and measurementTime unit converter
Convert fixed durations from microseconds to weeks.
Units and measurementPressure converter
Convert pressure into pascals, bar, psi and more.
Units and measurementEnergy converter
Convert energy units with explicit calorie definitions.
Units and measurementPower converter
Convert watts and defined horsepower units.
Units and measurementCooking measurements
Convert cooking volumes without guessing ingredient mass.
Units and measurementFuel consumption converter
Compare fuel consumption and US or UK mpg.
Units and measurementNumber base converter
Convert whole numbers between bases 2 and 36.
Units and measurementRoman numeral converter
Translate canonical Roman numerals and whole numbers.
Units and measurementShoe size converter
Estimate shoe sizing from foot length and allowance.
Units and measurement