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Watts to Amps Calculator
Convert watts to amps for any voltage. Calculate current draw from power rating. DC and AC (single/three phase) supported.
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 Watts to Amps 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 watts to amps?
Amps = Watts / Volts. A 1,200W microwave on 120V draws 10 amps. On 240V, it would draw 5 amps.