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Power factor (PF) calculator

Power factor compares real electrical power with apparent power.

PF=kWkVA\mathrm{PF} = \frac{\mathrm{kW}}{\mathrm{kVA}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

kVA
kW
—

Worked example

Given

  • kVA\mathrm{kVA} = 47 kVA
  • kW\mathrm{kW} = 40 kW
PF=4047≈0.8511\mathrm{PF} = \frac{40}{47} \approx 0.8511

Symbols and units

SymbolMeaningUnit
PF\mathrm{PF}power factor—
kVA\mathrm{kVA}apparent electrical powerkVA
kW\mathrm{kW}real electrical powerkW

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.