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Mihsaba›Power Factor Calculator

Power Factor Calculator

Calculate power factor, apparent power, reactive power and phase angle from voltage, current and real power for a single-phase circuit.

Results are idealized or estimated; component behavior, temperature, losses and battery discharge curves can change real-world values.

How to use

This power-factor calculator compares real watts with apparent VA in a single-phase circuit. From RMS voltage, RMS current and real power it calculates PF, reactive power and phase angle.

  1. Enter RMS voltage and current.
  2. Enter real power in watts.
  3. Ensure P does not exceed V×I.
  4. Review PF, VA, var and angle.

How it is calculated

S=VI; PF=P/S; Q=√(S²−P²); φ=cos⁻¹(PF)

Example

Example: 230 V, 10 A and 1840 W gives S=2300 VA and PF≈0.8.

Important notes

This assumes a single-phase sinusoidal context. Nonlinear loads and harmonics require a more complete power-factor treatment.

Frequently asked questions

Can PF exceed 1?

Not in this model, so P>VI is rejected.

W versus VA?

W is real power; VA is apparent power.

Is Q always positive?

The calculator reports magnitude; these inputs alone do not identify leading or lagging sign.