Conversions

Amps to Watts Calculator

By HowMuchWatts Editorial Team Reviewed June 30, 2026 Formula and source method

This calculator converts a current in amps into power in watts, using your voltage and power factor.

Change any number below — your result updates instantly, no button to click.

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Written & maintained by the HowMuchWatts team · Last updated June 30, 2026 · How we verify our numbers

How it works

Watts = amps × volts × power factor. For DC or resistive loads, power factor is 1, so watts = amps × volts. A lower power factor (common for motors) means fewer real watts for the same current.

Frequently asked questions

How many watts is 10 amps?

At 120 V and power factor 1, that’s 1,200 W. At 230 V it’s 2,300 W. Voltage matters, so enter yours above.

Do I need the power factor?

For DC and simple resistive devices, leave it at 1. For motors and some electronics, a value around 0.8 is more accurate.

Why convert amps to watts?

Appliances are often rated in amps but billed by energy (watts × time). Converting helps you estimate running costs and size circuits.

These calculators provide general estimates for educational purposes only and are not financial advice. Real-world results depend on factors not captured here. Verify figures independently before making any purchase or financial decision.

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