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Unit conversions

445 conversions, grouped by what they measure. Each one gives the exact factor, says whether the conversion is exact by definition, and shows what the rounded version everybody carries in their head actually costs.

If you want to convert between any two units at once rather than one named pair, the unit converter does that on a single page.

Length and distance

centimetres to inches inches to centimetres inches to millimetres millimetres to inches centimetres to feet feet to centimetres metres to feet centimetres to millimetres kilometres to miles miles to kilometres millimetres to centimetres feet to metres inches to feet centimetres to metres feet to millimetres metres to centimetres millimetres to feet feet to inches millimetres to metres yards to metres kilometres to metres metres to inches metres to kilometres inches to metres feet to miles metres to millimetres metres to miles feet to yards metres to yards yards to feet feet to kilometres kilometres to feet miles to feet miles to nautical miles nautical miles to kilometres centimetres to kilometres kilometres to centimetres miles to metres yards to miles metres to nautical miles millimetres to micrometres centimetres to yards kilometres to millimetres inches to yards millimetres to kilometres yards to centimetres metres to micrometres miles to millimetres kilometres to nautical miles miles to yards yards to inches kilometres to yards yards to kilometres millimetres to yards yards to millimetres centimetres to micrometres miles to inches centimetres to miles miles to centimetres inches to kilometres inches to miles kilometres to inches feet to nautical miles millimetres to miles inches to micrometres yards to nautical miles kilometres to micrometres inches to nautical miles

Weight and mass

pounds to kilograms kilograms to pounds kilograms to stone stone to kilograms grams to ounces grams to kilograms kilograms to grams ounces to grams pounds to grams grams to pounds ounces to pounds grams to milligrams milligrams to grams pounds to ounces kilograms to ounces milligrams to micrograms ounces to kilograms tonnes to kilograms ounces to long tons pounds to stone stone to pounds kilograms to tonnes tonnes to pounds pounds to tonnes milligrams to kilograms kilograms to milligrams grams to micrograms milligrams to ounces tonnes to grams grams to tonnes milligrams to pounds pounds to milligrams kilograms to micrograms ounces to tonnes ounces to milligrams kilograms to short tons tonnes to ounces grams to stone milligrams to tonnes ounces to stone stone to ounces tonnes to short tons stone to grams tonnes to milligrams stone to milligrams stone to tonnes tonnes to stone pounds to short tons milligrams to stone

Temperature

°C to °F °F to °C °C to kelvin kelvin to °C °F to kelvin kelvin to °F °F to °Rankine °Rankine to °F °Rankine to kelvin °C to °Rankine kelvin to °Rankine °Rankine to °C

Area

ft² to m² m² to ft² acres to ft² acres to hectares hectares to acres ft² to acres acres to m² m² to acres m² to yd² yd² to m² hectares to ft² ft² to in² in² to ft² ft² to hectares hectares to m² m² to hectares yd² to ft² ft² to yd² cm² to m² m² to cm² hectares to km² acres to mi² mi² to acres acres to km² cm² to ft² in² to m² acres to yd² m² to km² ft² to cm² yd² to acres km² to mi² mi² to km² km² to acres km² to m² km² to hectares cm² to in² ft² to mi² in² to cm² mi² to ft² hectares to mi² mi² to hectares cm² to km² km² to cm² in² to yd² m² to in² km² to ft² mi² to m² m² to mi² mi² to yd² yd² to in² in² to acres hectares to cm² yd² to mi² cm² to hectares ft² to km² mi² to in² cm² to acres yd² to hectares km² to yd² hectares to yd² cm² to yd² km² to in²

Data

kilobytes to megabytes megabytes to kilobytes gigabytes to megabytes megabytes to gigabytes megabytes to bytes gigabytes to kilobytes kilobytes to gigabytes bytes to megabytes bytes to gigabytes gigabytes to bytes gigabytes to terabytes terabytes to gigabytes bytes to bits megabytes to bits kilobytes to bytes bytes to kilobytes megabytes to terabytes terabytes to megabytes bytes to terabytes gigabytes to mebibytes kilobytes to terabytes terabytes to kilobytes gigabytes to gibibytes terabytes to bytes bytes to gibibytes terabytes to tebibytes gigabytes to bits bits to megabytes bytes to mebibytes megabytes to mebibytes kilobytes to bits terabytes to bits terabytes to gibibytes bytes to tebibytes gigabytes to tebibytes bytes to kibibytes megabytes to gibibytes kilobytes to kibibytes kilobytes to gibibytes gigabytes to kibibytes terabytes to mebibytes megabytes to tebibytes

Time

hours to minutes minutes to hours minutes to seconds seconds to milliseconds seconds to minutes hours to days seconds to days seconds to hours hours to years (Julian) minutes to milliseconds milliseconds to minutes days to minutes milliseconds to seconds seconds to years (Julian) days to years (Julian) hours to weeks hours to seconds minutes to years (Julian) days to hours minutes to days milliseconds to hours days to weeks days to seconds seconds to weeks milliseconds to days hours to milliseconds days to milliseconds milliseconds to weeks milliseconds to years (Julian)

Pressure

psi to bars bars to psi kilopascals to psi bars to pascals kilopascals to bars psi to kilopascals atmospheres to pascals pascals to atmospheres bars to kilopascals pascals to bars pascals to psi psi to pascals atmospheres to bars bars to atmospheres torr to atmospheres kilopascals to pascals pascals to millibars atmospheres to kilopascals bars to millibars kilopascals to atmospheres kilopascals to millibars kilopascals to mmHg millibars to kilopascals psi to millibars atmospheres to mmHg atmospheres to psi psi to atmospheres psi to inHg atmospheres to torr hectopascals to bars hectopascals to millibars hectopascals to pascals pascals to kilopascals millibars to hectopascals hectopascals to kilopascals pascals to mmHg bars to mmHg psi to mmHg hectopascals to mmHg hectopascals to psi pascals to torr bars to torr hectopascals to inHg kilopascals to hectopascals kilopascals to inHg kilopascals to torr pascals to hectopascals psi to torr hectopascals to atmospheres atmospheres to millibars bars to hectopascals psi to hectopascals hectopascals to torr bars to inHg pascals to inHg atmospheres to inHg atmospheres to hectopascals

Volume and capacity

millilitres to litres litres to millilitres cubic metres to litres litres to cubic metres cubic metres to US gallons litres to US gallons US gallons to litres millilitres to cubic metres US gallons to cubic metres cubic metres to millilitres litres to imperial gallons imperial gallons to litres imperial gallons to US gallons US pints to millilitres US gallons to imperial gallons imperial gallons to cubic metres cubic metres to imperial gallons US gallons to millilitres US pints to litres litres to imperial pints imperial pints to litres millilitres to US gallons imperial gallons to millilitres imperial pints to millilitres imperial pints to US pints US fluid ounces to millilitres US gallons to imperial pints US pints to imperial pints US pints to US cups US pints to US gallons

Energy

Calories (kcal) to kilojoules kilojoules to calories kilojoules to Calories (kcal) calories to kilojoules calories to Calories (kcal) Calories (kcal) to calories joules to electronvolts joules to kilojoules kilojoules to joules BTU to kilowatt hours joules to calories joules to megajoules joules to kilowatt hours kilowatt hours to joules kilojoules to kilowatt hours megajoules to kilowatt hours joules to BTU Calories (kcal) to kilowatt hours kilowatt hours to megajoules kilowatt hours to watt hours joules to Calories (kcal) Calories (kcal) to joules kilowatt hours to kilojoules BTU to joules joules to watt hours watt hours to joules kilojoules to megajoules BTU to Calories (kcal) BTU to kilojoules Calories (kcal) to BTU kilowatt hours to BTU BTU to watt hours kilojoules to BTU kilowatt hours to Calories (kcal) BTU to calories Calories (kcal) to megajoules kilowatt hours to calories BTU to therms BTU to megajoules kilowatt hours to therms kilojoules to watt hours kilojoules to electronvolts Calories (kcal) to electronvolts watt hours to kilojoules Calories (kcal) to watt hours kilowatt hours to electronvolts

Power

kilowatts to horsepower horsepower to kilowatts kilowatts to megawatts watts to horsepower horsepower to watts watts to kilowatts horsepower to metric horsepower (PS) kilowatts to watts metric horsepower (PS) to horsepower kilowatts to metric horsepower (PS) watts to BTU per hour watts to megawatts metric horsepower (PS) to kilowatts metric horsepower (PS) to watts horsepower to megawatts

Speed

km/h to mph knots to mph knots to km/h mph to km/h mph to m/s m/s to mph km/h to m/s km/h to knots mph to knots knots to m/s m/s to km/h m/s to knots mph to ft/s ft/s to mph km/h to ft/s knots to ft/s m/s to ft/s

Angle

degrees to radians radians to degrees degrees to arcseconds radians to arcseconds degrees to arcminutes degrees to gradians radians to gradians radians to arcminutes degrees to turns

Force

pounds-force to newtons newtons to pounds-force kilograms-force to newtons newtons to kilograms-force newtons to dynes pounds-force to kilograms-force kilograms-force to pounds-force kilograms-force to dynes pounds-force to dynes