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Amps to Watts Calculator
Convert amps to watts for DC and AC circuits. Calculate power in watts from current in amps and voltage. Free electrical calculator.
Enter any 2 of the 4 values — the rest will be calculated automatically.
Volts
Amps
Ohms Ω
Watts
Voltage
12 V
Current
2 A
Resistance
6 Ω
Power
24 W
Ohm's Law: V = I × R | P = V × I | P = I² × R | P = V² / R
How to Use the Amps to Watts Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
How do I convert amps to watts?
Watts = Amps × Volts. For a 10A device on 120V: 10 × 120 = 1,200 watts (1.2 kW).