Three-Phase Power Calculator
Work out three-phase power from voltage, current and power factor.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Three-Phase Power Calculator
How to use this tool
- Enter the values in the fields above.
- Press Generate to see the result.
- Use Load sample to try the worked example, Copy result to copy it, or Clear to start again.
Worked example
At 400 V, 10 A and a power factor of 0.8, apparent power is 1.732 × 400 × 10 = 6928.20 VA, so real power is 6928.20 × 0.8 = 5542.56 W, or 5.54 kW.
What this tool does not do / Limits
This is an estimate for a balanced three-phase load using the stated voltage, current and power factor. It is not a substitute for a datasheet or a qualified electrician, and it does not cover unbalanced loads, harmonics, or motor starting conditions.
Frequently asked questions
What is the square root of 3 doing here?
In a balanced three-phase system, total power is the square root of 3 times line voltage times line current times power factor.
Why is real power lower than apparent power?
Power factor below 1 means part of the apparent power does no useful work, so real power is apparent power multiplied by the power factor.
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