How this calculator works
Enter rms voltage (v), rms current (a), power factor. CalcStack applies the displayed formula and reports each intermediate planning value with the units shown.
Formula / method
Real power = V × I × power factor; apparent power = V × I
Worked example
230 V, 10 A and 0.9 power factor equals 2,070 W real power.
Assumptions and limitations
The load is single phase and RMS measurements are accurate.
Three-phase systems, harmonics, nonlinear loads and time-varying power factor need different models.