Calculatium

Three-Phase Power Calculator

Calculate apparent and active power for a balanced three-phase system from line-to-line voltage, line current and power factor.

Enter your values

The starting values are editable examples. Results update when you change your inputs.

Example: 400
Example: 10
Example: 0.8

Your result

Updates as you change your values.

Enter values to calculate.

How it is calculated

Apparent power S = √3 × line-to-line voltage × line current. Active power P = S × power factor.

Worked example

At 400 V, 10 A and power factor 0.8, apparent power is about 6,928.20 VA and active power about 5,542.56 W.

Before you calculate

Use line-to-line voltage, not line-to-neutral voltage. The current should be the line current and the power factor must represent the load being assessed. The calculation assumes a balanced three-phase system.

Interpreting the result

This formula does not design a supply, size conductors or select protection. Imbalance, harmonics, starting demand and equipment limits need separate assessment. Apparent power and active power are different quantities and should not be interchanged.

Use the units shown beside each field. Monetary fields labelled EUR stay in euros; changing language does not exchange currencies. Results are estimates under the stated assumptions.