Formula
Qc (kvar) = P (kW) × [tan(acos(PF1)) − tan(acos(PF2))]
Worked example
For 20 kW at power factor 0.75, correcting to 0.95: Qc = 20 × [tan(acos(0.75)) − tan(acos(0.95))] ≈ 11.06 kvar.
Power Factor Correction Calculator: kVAR Formula
Estimate capacitive compensation needed to improve the displacement power factor of an inductive load.
Open interactive calculator →Important limitations
This estimates reactive power only. Do not select capacitor banks directly from this number: harmonics, resonance, switching transients, detuning and manufacturer ratings require engineering assessment.
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Educational approximation only. Verify results and applicable standards before electrical installation work.