Convert between watts (power) and amps (current) using voltage and power factor — supports both watts-to-amps and amps-to-watts, for single-phase or three-phase supply, in W or kW.
How to Use the Watt to Amp Calculator
Choose the conversion direction: Watts/kW to Amps, or Amps to Watts.
Enter the power (or current), the supply voltage, and the power factor.
Select single-phase or three-phase, then click "Calculate".
Frequently Asked Questions
Single-phase: Current (A) = Power (W) ÷ (Voltage × Power Factor). Three-phase: Current (A) = Power (W) ÷ (√3 × Voltage × Power Factor).
Resistive loads (heaters, incandescent bulbs) are close to 1.0. Motors, fans, and ACs are typically 0.8–0.9. If you're unsure, 0.9 is a common estimate for general household appliances.
Yes, it's completely free and requires no sign-up.