Power Factor Calculator

Power factor is the ratio of real power (W) to apparent power (VA).

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Formula

PF = W ÷ VA
1φ VA = V × I; 3φ VA = 1.732 × V × I

Example calculation

2,800 W at 240 V and 13 A → PF 0.90.

Practical HVAC use

Evaluate motor loading and correction needs.

Common mistakes

Using a meter that doesn't measure true RMS.

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Single-Phase Power

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Three-Phase Power

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Calculate three-phase kW and kVA from line-to-line voltage, line current and power factor using √3.

Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators