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Three-Phase Power Calculator

Power, current, kVA, PF and efficiency-corrected sizing current for three-phase systems. 5 inputs, 6 outputs with grouped results.

Inputs

Supply

Line-to-line volts: 208, 240, 400, 480, 600.

System

Common LV system; sets the check voltage.

Load

Measured or nameplate current per phase.

Displacement PF from the nameplate or meter.

Set above 0 to solve current back from a known kW.

Result

Apparent power
Waiting for calculation.
Reactive power
Waiting for calculation.
Real power
Waiting for calculation.
Current from known kW
Waiting for calculation.
125% sizing current
Waiting for calculation.
Screening calculation only. Verify against NEC articles cited on the page and the equipment nameplate; the authority having jurisdiction governs.

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Workspace

Keep the assumptions with the result.

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