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  1. Home
  2. Units & math
  3. Power factor correction
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Power factor correction

Size the capacitor bank that moves a load to a target power factor, with per-phase capacitance, released capacity, and bank steps.

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Enter the load and both power factors to size the bank.

The formulas: Qc = kW × (tan(arccos pf₁) − tan(arccos pf₂)), kVA = kW ÷ pf, capacitance per phase from Q = 2πfCV² with a factor of 3 for the delta bank, line current falling by pf₁/pf₂ and I²R cable losses by its square. The kW never changes; only kVA and current drop. This is displacement power factor for a balanced load: harmonic distortion is not measured and a plain bank cannot fix it. A step suggestion from this page is a starting point, not a design; have a qualified engineer verify the installation against IEC 60831-1, IEC 61921, and IEEE 519.

Load and supply

SupplyAssumed balanced across phases
More settings▾

Up to 24 steps, separated by commas. The table below switches them in one at a time and shows the power factor after each. The transformer rating is optional; with it you get the released capacity.

Numbers stay within ±1,000,000. The target must sit above the present power factor: lowering it would take inductance, and this tool only sizes capacitors.

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