Three-Phase Power Calculator

Calculate apparent, real, and reactive power for balanced three-phase loads. Supports both Star (Y) and Delta (Δ) connections.

Inputs

V

A per phase (identical)

Lagging (inductive)

° — edit PF or angle, the other updates automatically

Results

Apparent Power (S)

kVA

Real Power (P)

kW

Reactive Power (Q)

kVAR

Phase Voltage (Vph)

V

Phase Current (Iph)

A

Power Triangle

φ = ° ()

S = kVA

P = S × cos φ = kW

Q = S × sin φ = kVAR

Formulas (balanced load)

Star (Y)

Vph = VLL / √3

Iph = IL

Delta (Δ)

Vph = VLL

Iph = IL / √3

S = √3 × VLL × IL

P = √3 × VLL × IL × cos φ

Q = √3 × VLL × IL × sin φ

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