Power factor
PF = P / S
Electrical calculator
Power Factor Calculator
Evaluate AC power efficiency and phase relationship.
Calculator
Enter values
Results update automatically as you type.
Result
About this calculator
How it works
Power factor is the ratio of real power to apparent power. It indicates how effectively an AC system converts supplied power into useful work.
Formulas
Formulas used
Phase angle
PF = cos(phi)
Guide
How to use this calculator
- Choose the mode or component type if the calculator provides one.
- Enter known values and select the units beside each input.
- Read the highlighted result first, then use the table for supporting calculated values.
Reference
What the results mean
Power factor
How effectively apparent power becomes real power.
Phase angle
The angular separation between voltage and current.
FAQ
Power Factor Calculator questions
Can I use different units?
Yes. Select the unit beside each input. The calculator converts values internally before solving.
Are the results suitable for final design?
Use results for education, screening, and early design checks. Verify final work against standards, datasheets, and project requirements.
Why does the result update automatically?
The calculator listens for input changes and recalculates as soon as enough valid values are available.
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