Size the capacitor bank you need
Enter your load and present power factor. We calculate the kVAR to add, a suggested APFC bank, the drop in current and kVA, and what it can save on your bill.
- Required kVAR and bank size
- Lower current and kVA demand
- Savings and payback
Your inputs
Cost assumptions
Apparent power, before and after
Indicative estimate only. Real results depend on your equipment, site conditions and applicable standards. This is not a design or an offer.
Want this checked by an engineer?
Send us your result and we’ll review it and prepare a recommendation and quotation.
Chat on WhatsApp insteadMethod & assumptions
- Required kVARkW × (tan φ₁ − tan φ₂), where φ is the angle of the power factor.
- Bank sizeRounded up to standard APFC steps (5 / 12.5 / 25 kVAR).
- CurrentI = kVA × 1000 ÷ (√3 × V).
- SavingReduction in kVA × your demand charge × 12. Utility incentives or penalties are not included.
- HarmonicsIn plants with significant harmonics, detuned (reactor-protected) banks are recommended.
About this calculator
What target power factor should I choose?
0.95 to 0.99 is common. Many utilities give incentives above 0.95 and penalise below 0.90; check your tariff.
Can I over-correct?
Yes - leading power factor can cause voltage rise and resonance. An automatic (APFC) panel switches steps to follow the load.
Do I need detuned capacitors?
If your load has VFDs, UPS or other harmonic sources, detuned reactors are advised. Our engineers will check this in the proposal.
Is the cost accurate?
No - it is a planning figure. The bank, panel make and reactors change the price.