Free Power Factor Calculator
Calculate the power factor from real power and apparent power measurements.
kW
kVA
Power Factor
0.833
Reactive Power (Q)16.58 kVAR
Phase Angle38.0 degrees
Power Factor vs Real Power (P)
Power Factor
Power factor indicates how effectively electrical power is being converted to useful work.
Formulas
PF = P / S = kW / kVA
Q = sqrt(S^2 - P^2)
A power factor of 1.0 means all power is real (useful). Low power factor means more current flows than needed, increasing losses. Industrial facilities typically aim for PF > 0.95 to avoid utility penalties.
Example Calculation
A facility drawing 30 kVA with 25 kW real power.
- 01PF = 25 / 30 = 0.833
- 02Q = sqrt(30^2 - 25^2) = sqrt(900 - 625) = sqrt(275) = 16.58 kVAR
- 03Phase angle = arccos(0.833) = 33.6 degrees
Frequently Asked Questions
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