Power Factor Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the real power (kW) and apparent power (kVA).
- Read the power factor.
How it works
Power factor = kW ÷ kVA.
Worked example
8 kW from 10 kVA. = 0.8 power factor.
Common mistakes
- Swapping kW and kVA.
- Forgetting power factor is between 0 and 1.
Frequently asked questions
Why does power factor matter?
A low power factor means more current for the same useful power, which can mean bigger cables and utility penalties.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.