Three-Phase Power Calculator

Balanced three-phase power multiplies by √3 (1.732).

HVAC Pro calculator — inputs, formula and example are open to everyone.

Result

Results for this calculator are part of HVAC Pro

You can see the inputs, formula and worked example. Unlock results for every Pro calculator.

Unlock with HVAC Pro

Already a member? Sign in

Formula

P = √3 × V × I × PF
S = √3 × V × I

Example calculation

208 V × 20 A × 1.732 × 0.85 = 6.12 kW.

Practical HVAC use

Rooftop units, chillers and commercial motors.

Common mistakes

Using line-to-neutral voltage with the √3 formula.

Related calculators

Three-Phase Amps

Pro

Calculate three-phase line current from kW, voltage and power factor.

Single-Phase Power

Pro

Calculate single-phase real power (W) and apparent power (VA) from voltage, current and power factor.

Motor Amps from HP

Pro

Estimate motor full-load current from horsepower, voltage, efficiency and power factor for single or three-phase motors.

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