Amps to Watts Calculator

Watts are amps multiplied by volts. On a 120-volt household circuit, a 10-amp appliance draws 1,200 watts.

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Your answer

10 A at 120 V =1,200 W

Kilowatts
1.2 kW

The math behind it: Amps to Watts

DC: W = A x V AC single phase: W = A x V x PF AC three phase: W = √3 x A x V x PF

PF is the power factor, a number between 0 and 1 that describes how effectively an AC load uses current. Heaters and incandescent lamps are close to 1; motors are typically 0.8 to 0.9.

Common questions

How many watts can a 15-amp circuit handle?

At 120 volts, 15 amps is 1,800 watts. Electrical codes limit continuous loads to 80% of that, or 1,440 watts.

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