Watt conversions

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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.

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.