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Power Factor Correction Calculator

Calculate required kVAR and capacitor size

Input Parameters

About This Calculator

  • Qc = P × (tan(acos(PF₁)) - tan(acos(PF₂)))
  • C = Qc / (2π × f × V²)
  • Target PF ≥ 0.95 recommended

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How this power factor correction calculator works

Required reactive compensation: Qc = P × (tan(acos(PF₁)) - tan(acos(PF₂))).

The capacitor size in μF: C = Qc / (2π × f × V²). Improving PF reduces current draw and utility penalties.

FAQ

What is PFC?

Adding capacitors to reduce reactive power, PF closer to 1.

kVAR formula?

Qc = P × (tan(acos(PF₁)) - tan(acos(PF₂))).

Good power factor?

≥0.95 ideal. Below 0.90 often penalized.

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