- Watt definition
- Watt to mW, kW, MW, GW, dBm, dBW conversion calculator
- Table of unit prefixes of watt
- How to convert watts to kilowatts
- How to convert watts to milliwatts
- How to convert watts to dBm
- How to convert watts to amps
- How to convert watts to volts
- How to convert watts to ohms
- How to convert watts to btu
- How to convert watts to joules
- How to convert watts to horsepower
- How to convert watts to kVA
- How to convert watts to VA
- Power consumption table

Watt is the unit of power (symbol: W).

The watt unit is named after James Watt, the inventor of the steam engine.

One watt is defined as the energy consumption rate of one joule per second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage of one volt.

1W = 1V × 1A

Convert watt to milliwatt, kilowatt, megawatt, gigawatt, dBm, dBW.

Enter the power in one of the text boxes and press the *Convert* button:

name | symbol | conversion | example |
---|---|---|---|

picowatt | pW | 1pW = 10^{-12 }W |
P_{ }= 10 pW |

nanowatt | nW | 1nW = 10^{-9 }W |
P_{ }= 10 nW |

microwatt | μW | 1μW = 10^{-6 }W |
P_{ }= 10 μW |

milliwatt | mW | 1mW = 10^{-3 }W |
P = 10 mW |

watt | W | - | P = 10 W |

kilowatt | kW | 1kW = 10^{3 }W |
P_{ }= 2 kW |

megawatt | MW | 1MW = 10^{6 }W |
P_{ }= 5 MW |

gigawatt | GW | 1GW = 10^{9 }W |
P_{ }= 5 GW |

The power P in kilowatts (kW) is equal to the power P in watts (W) divided by 1000:

*P*_{(kW)} = *P*_{(W)} / 1000

The power P in milliwatts (mW) is equal to the power P in watts (W) times 1000:

*P*_{(mW)} = *P*_{(W)} ⋅ 1000

The power P in decibel-milliwatts (dBm) is equal to 10 times base 10 logarithm of the power P in milliwatts (mW) divided by 1 milliwatt:

*P*_{(dBm)} = 10 ⋅ log_{10}( *P*_{(mW)} / 1mW)

The current I in ampers (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):

*I*_{(A)} = *P*_{(W)} / *V*_{(V)}

The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in ampers (A):

*V*_{(V)} = *P*_{(W)} / *I*_{(A)}

*R*_{(Ω)} = *P*_{(W) }*/ I*_{(A)}^{2}

*R*_{(Ω)} = *V*_{(V)}^{2}/* P*_{(W)}

*P*_{(BTU/hr)} = 3.412142 ⋅ *P*_{(W)}

*E*_{(J)} = *P*_{(W)} ⋅ *t*_{(s)}

*P*_{(HP)} = *P*_{(W) }/ 746

The real power P in watts (W) is equal to 1000 times the apparent power S in kilo-volt-amperes (kVA) times the power factor (PF) or cosine of the phase angle φ:

*P*_{(W)} = 1000 ⋅ S_{(kVA)} ⋅ *PF* = 1000 ⋅ *S*_{(kVA)} ⋅ cos *φ*

The real power P in watts (W) is equal to the apparent power S in volt-amperes (VA) times the power factor (PF) or cosine of the phase angle φ:

*P*_{(W)} = *S*_{(VA)} ⋅ *PF* = *S*_{(VA)} ⋅ cos *φ*

How many watts does a house use? How many watts does a TV use? How many watts does a refrigerator use?

Electric component | Typical power consumption in watts |
---|---|

LCD TV | 30..300 W |

LCD monitor | 30..45 W |

PC desktop computer | 300..400 W |

Laptop computer | 40..60 W |

Refrigerator | 150..300 W (when active) |

Light bulb | 25..100 W |

Fluorescent light | 15..60 W |

Halogen light | 30..80 W |

Speaker | 10..300 W |

Microwave | 100..1000 W |

Air conditioner | 1..2 kW |

- Electric power
- Decibel-milliwatt (dBm)
- Decibel-watt (dBW)
- Kilowatt (kW)
- Kilowatt-hour (kWh)
- Volt (V)
- Ampere (amps)
- Ohm
- Ohm's law
- Power conversion
- Watts to kW conversion
- Watts to mW conversion
- Watts to dBm conversion
- Watts to Horsepower conversion
- Watts to BTU/hr conversion
- Energy conversion
- Watts to Amps calculation
- Watts to Joules calculation
- Watts to Volts calculation
- Electrical units

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- Ampere (A)
- dB-milliwatt (dBm)
- dB-watt (dBW)
- Decibel (dB)
- Farad (F)
- Kilovolt-amp (kVA)
- Kilowatt (kW)
- Kilowatt-hour (kWh)
- Ohm (Ω)
- Volt (V)
- Watt (W)