Three Phase Power Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter line voltage, line current and power factor.
- Read the kW and kVA.
How it works
P (kW) = √3 × line voltage × line current × power factor; kVA drops the power factor.
Worked example
415 V, 20 A, 0.85 PF. ≈ 12.2 kW (14.4 kVA).
Common mistakes
- Using phase voltage where line voltage is required.
- Forgetting the √3 factor for three-phase.
Frequently asked questions
Single vs three phase?
Single-phase power is V × I × PF; three-phase adds the √3 factor for the three line conductors.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.