Electric current in amps (A) to electric power in watts (W) calculator.

Select current type, enter current in amps, voltage in volts,power factor for AC circuit and press the *Calculate* button (DC = Direct Current, AC = Alternating Current):

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

### DC amps to watts calculation

The power *P* in watts (W) is equal to the current *I* in amps (A), times the voltage *V* in volts (V):

*P*_{(W)} = *I*_{(A)}* *×* V*_{(V)}

### AC single phase amps to watts calculation

The power *P* in watts (W) is equal to the power factor *PF* times the phase current *I* in amps (A), times the RMS voltage *V* in volts (V):

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

### AC three phase amps to watts calculation

#### Calculation with line to line voltage

The power *P* in watts (W) 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):

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

#### Calculation with line to neutral voltage

The power *P* in watts (W) 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):

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

### Typical power factor values

Do not use typical power factor values for accurate calculations.

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

Resistive load | 1 |

Fluorecent 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 |

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