Amps (A) to kilowatts (kW) calculator.

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

## DC amps to kilowatts calculation

The power *P* in kilowatts (kW) is equal to the current *I* in amps (A), times the voltage *V* in volts (V) divided by 1000:

*P*_{(kW)} = *I*_{(A)}* *×* V*_{(V)} / 1000

## AC single phase amps to kilowatts calculation

The power *P* in kilowatts (kW) is equal to the
power factor *PF* times the phase current *I* in amps (A), times the RMS voltage *V* in volts (V) divided by 1000:

*P*_{(kW)} = * PF *×* I*_{(A)}* *×* V*_{(V)} / 1000

## AC three phase amps to kilowatts calculation

#### Calculation with line to line voltage

The power *P* in kilowatts (kW) is equal to square root of 3 times the power factor *PF* times the phase current *I* in amps (A), times the line to line RMS voltage *V*_{L-L} in volts (V) divided by 1000:

*P*_{(kW)} = *√*3
× * PF *×* I*_{(A)}* *×* V*_{L-L (V)} / 1000

#### Calculation with line to neutral voltage

The power *P* in kilowatts (kW) is equal to 3 times the power factor *PF* times the phase current *I* in amps (A), times the line to neutral RMS voltage *V*_{L-N} in volts (V) divided by 1000:

*P*_{(kW)} = 3 × * PF *×* I*_{(A)}* *×* V*_{L-N (V)} / 1000

## Typical power factor values

Do not use typical power factor values for accurate calculations.

Device | Typical power factor |
---|---|

Resistive load | 1 |

Fluorescent lamp | 0.95 |

Incandescent lamp | 1 |

Induction motor full load | 0.85 |

Induction motor no load | 0.35 |

Resistive oven | 1 |

Synchronous motor | 0.9 |

## Ampere definition

Ampere or amp (symbol: A) is the unit of electrical current.

The Ampere unit is named after Andre-Marie Ampere, from France.

One Ampere is defined as the current that flows with electric charge of one Coulomb per second.

1 A = 1 C/s

## Watt definition

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

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