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Electrical Calculators

Three-Phase Power Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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V
A
Verified formula Private

Real power

5.750

Apparent power
7.188

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Three-Phase Power Calculator

The Three-Phase Power Calculator works out your real power, along with 1 related figure in an instant. Enter line voltage, line current and power factor and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the line voltage.
  2. Enter the line current.
  3. Enter the power factor.
  4. Read off your real power, together with apparent power — the calculator updates automatically, with no button to press.

Formula

The Three-Phase Power Calculator uses the formula:

Real power = √(3) × Line voltage × Line current × Power factor ÷ 1000

Worked example

For example, with line voltage of 415 V, line current of 10 A and power factor of 0.8, the real power is 5.750.

Inputs used
Line voltage 415 V
Line current 10 A
Power factor 0.8
Results
Real power 5.750
Apparent power 7.188

Results are estimates for educational use, not professional advice.

Frequently asked questions

Real power = √3 × line voltage × line current × power factor. At 415 V, 10 A and 0.8 pf it is about 5.75 kW.

It accounts for the 120-degree phase difference between the three line voltages in a balanced system.

kW is real power that does work; kVA is apparent power. Power factor links them: kW = kVA × power factor.

This uses line voltage and line current, the values usually measured at the supply.

Enter the line voltage. Enter the line current. Enter the power factor. Read off your real power, together with apparent power — the calculator updates automatically, with no button to press.

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