Engineering unit converters

One page per quantity, each with a conversion table and a worked example. The full unit converter covers every unit group in one place.

• Pressure unit converterConvert bar, psi, kPa, MPa, atm, mmHg, metres of water and the other pressure and stress units engineers meet on gauges, datasheets and drawings.
• Temperature unit converterConvert between degrees Celsius, degrees Fahrenheit and kelvin. Temperature is the one common quantity where a conversion needs an offset as well as a factor.
• Length unit converterConvert metres, millimetres, feet, inches, miles and nautical miles, along with the fathom and the anchor cable shackle used at sea.
• Mass unit converterConvert kilograms, tonnes, pounds, long tons and short tons, the units that appear in cargo documents, lifting plans and datasheets.
• Speed unit converterConvert metres per second, kilometres per hour, knots, miles per hour and feet per second.
• Volume unit converterConvert cubic metres, litres, cubic feet, US and imperial gallons and oil barrels.
• Flow rate unit converterConvert the volume flow units used for pumps, fans and piping: m³/h, L/s, L/min, cfm and US and imperial gallons per minute.
• Power unit converterConvert kilowatts, megawatts, mechanical horsepower, metric horsepower and Btu per hour.
• Energy unit converterConvert joules, watt-hours, Btu, kilocalories and tonnes of oil equivalent.
• Force unit converterConvert newtons, kilonewtons, kilograms-force, tonnes-force, pounds-force and kips.
• Torque unit converterConvert newton-metres, kilonewton-metres, kilogram-force metres and pound-force feet and inches, as used on bolt tables and shaft data.
• Density unit converterConvert kg/m³, t/m³, g/cm³, kg/L and lb/ft³, the units used for fuels, cargoes and sea water.