# Watt conversions

The 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.

## About watt

The **watt** is the derived unit of power in the International System of Units (SI).

One watt (W) 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×m^{2}/s^{3}

Symbol: W

Plural: watts

## Subdivisions and multiples of the watt using SI prefixes

Subdivisions of the watt | ||
---|---|---|

Name | Symbol | Value |

deciwatt | dW | 10^{-1} W |

centiwatt | cW | 10^{-2} W |

milliwatt | mW | 10^{-3} W |

microwatt | μW | 10^{-6} W |

nanowatt | nW | 10^{-9} W |

picowatt | pW | 10^{-12} W |

femtowatt | fW | 10^{-15} W |

attowatt | aW | 10^{-18} W |

zeptowatt | zW | 10^{-21} W |

yoctowatt | yW | 10^{-24} W |

Multiples of the watt | ||
---|---|---|

Name | Symbol | Value |

decawatt | daW | 10^{1} W |

hectowatt | hW | 10^{2} W |

kilowatt | kW | 10^{3} W |

megawatt | MW | 10^{6} W |

gigawatt | GW | 10^{9} W |

terawatt | TW | 10^{12} W |

petawatt | PW | 10^{15} W |

exawatt | EW | 10^{18} W |

zettawatt | ZW | 10^{21} W |

yottawatt | YW | 10^{24} W |

Watt conversions: a compehensive list with conversions from watts to other (metric, imperial, or customary) power measurement units is given 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)