š Three Phase Power Calculator
Work out real, apparent, and reactive power for a balanced three-phase electrical circuit.
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What this calculator does
This tool calculates the power delivered by a balanced three-phase electrical system, a common configuration for industrial motors, HVAC equipment, and larger electrical services.
The formulas
Apparent power is S = ā3 Ć V_line Ć I_line (in volt-amps). Real (usable) power is P = S Ć PF, where PF is the power factor of the load. Reactive power follows from the power triangle: Q = ā(SĀ² ā PĀ²).
These formulas assume a balanced three-phase load (equal current and voltage on all three phases). This calculator is intended for general electrical planning and education, not as a substitute for a qualified electrician’s load calculations.
Last reviewed August 2026