How to convert Amps to Watts calculator

You can easily make calculations for watt from a quantity given in units of amps or volts; it is not possible to convert amps directly to watts because both of these units represent different quantity. Generally we have three types of appliances at home and it is good to learn the unit conversion technique for all of them.

  1.  DC amps to watts:

WATTS = Amps * Volts

For example:

If you want to know about power consumption in watts for current 3A and voltage 110V; result will be calculated simply as:

3A * 110V = 330 Watts

6A * 110V = 660 Watts


  1. From Single Phase AC to Watts:

If you need calculations for single phase devices then real power in watts will be given in terms of power factor times RMS voltage, times phase current; as:

P (W) = PF *I (A) * V (V)

So Watt = PF * Amp * Volt; or         W=PF*A*V


For example you need a transformer for appliance that is rated as 0.8- power factor, 3A- phase current; 110V- RMS voltage. Then power can be calculated as: 

P= 0.8* 3A * 110V = 264 W


  1. For Three Phase Amps to Watts:
  • Line to line voltage:

P (W) = √3 * PF * I (A) * V L-L (V)

Or Watt = √3 * PF * amp * volt


  • Line to Natural Voltage:

P (W) = 3 * PF * I (A) * V L-0 (V)

Or watt = 3 * PF * amp * volt



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