3-Phase Power Calculator

Calculate active, apparent, and reactive power values in 3-phase electrical systems.

3-Phase Power Calculator

Compute active, apparent, and reactive power from voltage, current, and power factor.

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Where is it used?

Useful for pre-sizing motors, feeders, and panel loads.

Lets you verify the voltage-current-power relation in one view.

What does it output?

Returns active power (kW), apparent power (kVA), and reactive power (kVAr).

Computes either voltage, current, or active power based on mode.

How the formula works

With line-to-line voltage, active power is P = √3 x V x I x power factor / 1000.

Apparent and reactive power are derived from power factor and the power triangle.

Input meaning

Voltage, current, and power factor jointly define the electrical load.

As power factor approaches 1, apparent power and active power converge.

Real-world example

A 400 V, 20 A, 0.85 power-factor load produces about 11.78 kW.

For generator and panel planning, kVA can matter as much as kW.

Limitations

The tool estimates steady-state operation, not inrush current, harmonics, or safety margins.

Cable, breaker, and panel choices require local code and electrical-engineer review.