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Calculator Tools
Electrical Engineering Calculators

Power Factor Calculator

Power factor from real and apparent power, plus the capacitor kVAR needed to correct it.

Enter values

Results update as you type.

Result

Correction capacitor needed

27.662 kVAR

Apparent power now
66.667 kVA
Apparent power after
52.632 kVA
Reactive power now
44.096 kVAR
Phase angle now
41.41 °
Current reduction
21.05%

About the Power Factor Calculator

Power factor from real and apparent power, plus the capacitor kVAR needed to correct it.

Also known as: pf correction, kvar calculator, power factor correction, cos phi.

How to use this calculator

  1. Enter real power, current power factor, target power factor.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

PF = kW / kVA · kVAR = kW × (tan φ₁ − tan φ₂)

Worked example

Using the values pre-filled in the calculator above:

  • Real power = 50 kW
  • Current power factor = 0.75
  • Target power factor = 0.95

the calculator returns:

  • Correction capacitor needed: 27.662 kVAR
  • Apparent power now: 66.667 kVA
  • Apparent power after: 52.632 kVA
  • Reactive power now: 44.096 kVAR