Amps to Watts Calculator

Convert amps to watts or watts to amps in seconds. Pick a direction, enter the voltage, and get the answer — the formula is W = V × A.

Power
1,200 watts

How It Works

Electrical power follows P = V × I: watts = volts × amps. Flip it for current: I = P ÷ V. This calculator applies both in either direction.

Calculation Explanation

Example: a toaster labeled 1,200W on a 120V outlet draws 10A (1200 ÷ 120). A 20A kitchen circuit at 120V can supply 2,400W total.

Need to size the circuit feeding that load? See the Breaker Size Calculator or check what wire gauge to run with the Wire Size Calculator.

Quick Reference: Amps → Watts

CurrentWatts @ 120VWatts @ 240V
5A600 W1,200 W
10A1,200 W2,400 W
15A1,800 W3,600 W
20A2,400 W4,800 W
30A3,600 W7,200 W
50A6,000 W12,000 W

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Frequently Asked Questions