Conversions Calculators

Convert between metres, feet, inches, miles, kilometres and every other common unit of length.

Convert between kilograms, pounds, ounces, stones, tonnes and other units of mass.

Convert between Celsius, Fahrenheit, Kelvin and Rankine, with the offset handled correctly.

Convert between litres, gallons, cups, millilitres and other units of volume, with US and imperial measures kept separate.

Convert between kilometres per hour, miles per hour, metres per second, knots and mach.

Convert between bytes, kilobytes, megabytes, gigabytes and terabytes — with decimal and binary units kept separate.

Calculate your vehicle's actual fuel efficiency from distance driven and fuel used — in MPG, L/100km and km/L.

Decode a tire size like 225/45R17 into its overall diameter, circumference and revolutions per mile, and compare two sizes for speedometer error.

Convert between square metres, square feet, acres, hectares, square miles and more.

Convert between joules, calories, kilowatt-hours, BTU, therms and electronvolts.

Convert between watts, kilowatts, mechanical and metric horsepower, and BTU per hour.

Convert between pascals, bar, psi, atmospheres, torr and inches of mercury with exact definitions.

Convert between teaspoons, tablespoons, cups, fluid ounces and millilitres — including the US, imperial and metric differences.

Convert between degrees, radians, gradians, turns, arcminutes and arcseconds.

Convert between bits and bytes per second across kilo, mega and giga scales, including binary units.

Convert density between kg/m³, g/cm³, lb/ft³, lb/in³ and other units.

Convert volumetric flow between litres per second, cubic metres per hour, GPM and CFM.

Convert between newtons, pounds-force, kilograms-force, dynes and kips.

Convert between hertz, kilohertz, megahertz, gigahertz, RPM and radians per second.

Convert light levels between lux, foot-candles and phots.

Convert between seconds, minutes, hours, days, weeks, months and years.

Convert torque between newton-metres, pound-feet, pound-inches and kilogram-force metres.

Convert shoe sizes between UK, US, EU and centimetres by working through foot length, the only measurement all the systems agree on.