# Watt conversions

power conversions » watt conversionsThe watt conversion selector on this page selects the power measurement unit to convert to starting from watts (W). To make a conversion starting from a unit of power other than watt, simply click on the "Reset" button.

## What is watt?

The **watt** is the derived unit of power in the International System of Units (SI). One watt is equal to 1,000,000 microwatts (μW), or 1,000 milliwatts (mW), or 0.001 kilowatts (kW), or 10-6 megawatts (MW) or 10-9 gigawatts (GW).

The watt measures the rate at which the energy is transformed. One watt is equal to one joule per second. The joule is a derived unit of energy in the SI while the second is a unit of time in the SI. The watt unit is named after the Scottish engineer James Watt who lived between 1736 and 1819.

1 W = 1 J/s = 1 N·m/s = 1 kg·m2/s3

Common subdivisions and multiples of the watt using the SI prefixes:

- 1 milliwatt (mW) = 10-3 watts (W)
- 1 microwatt (μW) = 10-6 watts (W)
- 1 nanowatt (nW) = 10-9 watts (W)
- 1 picowatt (pW) = 10-12 watts (W)
- 1 femtowatt (fW) = 10-15 watts (W)
- ..........................................
- 1 kilowatt (kW) = 103 watts (W)
- 1 megawatt (MW) = 106 watts (W)
- 1 gigawatt (GW) = 109 watts (W)
- 1 terawatt (TW) = 1012 watts (W)
- 1 petawatt (PW) = 1015 watts (W)

*Symbol:*

W

*Plural:*

watts

## Watt conversions: quick links

A compehensive list with conversions from watts to other (metric, imperial, or customary) power measurement units is displayed below.

- watt to atmosphere-cubic centimeter per minute (W to atm ccm)
- watt to atmosphere-cubic centimeter per second (W to atm ccs)
- watt to BTU (IT) per hour (W to BTU/h)
- watt to BTU (IT) per minute (W to BTU/min)
- watt to BTU (IT) per second (W to BTU/s)
- watt to calorie per day (W to cal/d)
- watt to calorie per hour (W to cal/h)
- watt to calorie per minute (W to cal/min)
- watt to calorie per second (W to cal/s)
- watt to Celsius heat unit (IT) per hour (W to CHU/h)
- watt to Celsius heat unit (IT) per minute (W to CHU/min)
- watt to Celsius heat unit (IT) per second (W to CHU/s)
- watt to cubic foot de natural gas per hour
- watt to cubic foot de natural gas per minute
- watt to cubic foot de natural gas per second
- watt to erg per hour (W to erg/h)
- watt to erg per minute (W to erg/min)
- watt to erg per second (W to erg/s)
- watt to foot-pound-force per hour (W to ft lbf/h)
- watt to foot-pound-force per minute (W to ft lbf/min)
- watt to foot-pound-force per second (W to ft lbf/s)
- watt to gigawatt (W to GW)
- watt to horsepower (boiler) (W to hp)
- watt to horsepower (electric) (W to hp)
- watt to horsepower (hydraulic) (W to hp)
- watt to horsepower (mechanical) (W to hp)
- watt to horsepower (metric) (W to hp)
- watt to kilocalorie per day (W to kcal/d)
- watt to kilocalorie per hour (W to kcal/h)
- watt to kilocalorie per minute (W to kcal/min)
- watt to kilocalorie per second (W to kcal/s)
- watt to kilowatt (W to kW)
- watt to liter-atmosphere per minute (W to L atm/min)
- watt to liter-atmosphere per second (W to L atm/s)
- watt to lusec (W to lusec)
- watt to megawatt (W to MW)
- watt to microwatt (W to μW)
- watt to milliwatt (W to mW)
- watt to nanowatt (W to nW)
- watt to poncelet (W to p)
- watt to terawatt (W to TW)
- watt to ton of air conditioning
- watt to ton of refrigeration (IT) (W to TR)