Engineering CalculationPower Factor Correction Calculator - kVAr for Capacitor Bank / APFC
Find the capacitor kVAr needed to raise the power factor of a plant from its present value to a target, and size the APFC panel.
Open the calculator →Formula
kVAr = P × (tanφ1 − tanφ2)
φ1 = cos−1(present PF), φ2 = cos−1(target PF), P in kW
Worked example
500 kW load, power factor 0.80 to 0.98
kVAr = 500 × (0.750 − 0.203) = 273.5 kVAr
Where engineers use it
- APFC panel sizing for HT and LT consumers
- Avoiding power factor penalty on the electricity bill
- Reducing transformer and cable loading
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Does it work out the penalty saving?
Yes, the Electrical suite has a Power Factor Penalty / Incentive calculator using the slab method on your bill.