Power Factor Calculator
Calculate power factor from real and apparent power.
Formula
Power factor = real power / apparent power.
What Is Power Factor?
Power factor compares the real power that performs useful work with the apparent power supplied to an AC load. A value closer to 1 means more of the supplied VA is converted into real watts.
Example Calculation
If a load uses 800 W from 1,000 VA, power factor = 800 / 1,000 = 0.80.
Factors and Interpretation
Inductive and capacitive loads can create phase shift and reduce power factor. Nonlinear loads may also introduce distortion. This calculator uses the simple ratio of real to apparent power and does not distinguish leading from lagging power factor.
Frequently Asked Questions
Can power factor be greater than 1?
No. For normal definitions, it ranges from 0 to 1.
Is 1.0 power factor ideal?
Yes. It means real and apparent power are equal.
Does low power factor increase current?
For the same real power and voltage, lower power factor generally requires more current.
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Formula and Practical Limits
Power factor is real power divided by apparent power for the relevant AC system. Low power factor can arise from phase displacement or waveform distortion; it should not be confused with electrical efficiency.