Calculating Amps To Watts

Convert amps to watts using voltage and, for AC circuits, a power factor.

How the calculating amps to watts works

DC or single-phase approximation: watts = volts × amps × power factor. Three-phase: watts = √3 × line voltage × line current × power factor for a balanced system.

Example and useful facts

Example: Convert amps to watts using voltage and, for AC circuits, a power factor. Enter the sample values above, then change one input at a time to see how the result changes.

Formula and assumptions: DC or single-phase approximation: watts = volts × amps × power factor. Three-phase: watts = √3 × line voltage × line current × power factor for a balanced system.

Did you know? Amps alone cannot determine watts. Voltage and, for AC loads, power factor and phase configuration matter.

Frequently asked questions

What does the calculating amps to watts calculate?

Convert amps to watts using voltage and, for AC circuits, a power factor.

Are the results exact?

The result follows the formula and assumptions shown on this page. Real-world rules, measurements, rates, and individual circumstances can affect the final answer.

Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.