How to use it
- Enter current and voltage.
- Choose DC or single-phase AC.
- For AC, enter the assumed power factor and calculate.
Amps to Watts Calculator
Estimate power from current, 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 Amps to Watts Calculator
This page estimates real power from current and voltage and reports the result in watts and kilowatts.
How it works
DC power uses P = V × I. The simplified single-phase AC estimate uses P = V × I × PF.
Example
A 10 A DC load at 120 V corresponds to 1,200 W, or 1.2 kW, in the idealized calculation.
Notes
Measured electrical systems can differ because of losses, transients, waveform and phase conditions. Do not use this result to size real equipment.