Power Factor Calculator
Enter real power in kW and apparent power in kVA to estimate power factor and reactive power. This is a screening formula, not a power-quality study.
- Power factor
- PF
- Power factor
- %
- Reactive power
- kVAR
- Phase angle
- deg
- Apparent power used
- kVA
- Real power used
- kW
Calculation details
- Calculation basis
- Boundary
Recent results
Formulas
- Power factor = real power kW / apparent power kVA
- Power factor percent = power factor x 100
- Reactive power kVAR = sqrt(kVA^2 - kW^2)
- Phase angle degrees = arccos(power factor)
Use this calculator
Estimate power factor, percent power factor, phase angle, and kVAR from real and apparent power.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This is a power-quality screening estimate. It does not evaluate harmonics, resonance, capacitor switching, utility penalties, metering method, equipment ratings, or final correction equipment.
FAQs
What does a lower power factor mean?
For the same real power, a lower power factor means higher apparent power and current. Final interpretation depends on the load, metering, and utility rules.
Can this size capacitors?
No. It estimates PF and kVAR only. Capacitor bank sizing needs harmonic, switching, voltage, equipment, and utility review.