How to use it
- Enter power in watts and voltage in volts.
- Choose DC or single-phase AC.
- For AC, enter the assumed power factor, then calculate.
Watts to Amps Calculator
Estimate current from power, voltage and an optional single-phase AC power factor.
Important: This calculator is for educational and estimation purposes only. It is not electrical safety, installation, engineering, or code-compliance advice. Always consult a qualified electrician or engineer for real-world electrical work.
About the Watts to Amps Calculator
This calculator estimates current from real power and voltage for DC or a simplified single-phase AC case.
How it works
DC current uses I = P ÷ V. The single-phase AC estimate uses I = P ÷ (V × PF).
Example
A 1,200 W DC load at 120 V corresponds to 10 A in the idealized calculation.
Notes
This simplified estimate does not account for startup current, waveform, phase configuration, losses or installation requirements.