# Amps to Watts Calculator

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

* 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 |

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 |

## Amps to watts table (120V)

Current (A) | Voltage (V) | Power (W) |
---|---|---|

0.1 amps | 120 volts | 12 watts |

0.2 amps | 120 volts | 24 watts |

0.3 amps | 120 volts | 36 watts |

0.4 amps | 120 volts | 48 watts |

0.5 amps | 120 volts | 60 watts |

0.6 amps | 120 volts | 72 watts |

0.7 amps | 120 volts | 84 watts |

0.8 amps | 120 volts | 96 watts |

0.9 amps | 120 volts | 108 watts |

1 amps | 120 volts | 120 watts |

2 amps | 120 volts | 240 watts |

3 amps | 120 volts | 360 watts |

4 amps | 120 volts | 480 watts |

5 amps | 120 volts | 600 watts |

6 amps | 120 volts | 720 watts |

7 amps | 120 volts | 840 watts |

8 amps | 120 volts | 960 watts |

9 amps | 120 volts | 1080 watts |

10 amps | 120 volts | 1200 watts |