Power Factor Calculator

Enter real power and apparent power to calculate ideal sinusoidal power-factor quantities.

Real power P (W)

Apparent power S (VA)

—Power factor |P| / S

—Reactive magnitude (VAR)

—Phase magnitude

—Power factor

—P² + Q² ≈ S²

Educational / low-voltage electronics calculator. Real components have tolerances and non-ideal behavior. Do not use this page as a substitute for qualified design or safety guidance for mains/high-energy electrical systems.

How to use this Power Factor Calculator

Calculate power factor, reactive power, and phase angle from real and apparent power. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.