Three-Phase Power Calculator – kW, kVA, kVAR & Power Factor

Calculate real, reactive, and apparent power in 3-phase systems using voltage, current, and power factor.

Input Parameters

Select voltage measurement configuration
Phase voltage for LN, line voltage for LL
Line current per phase
Enter as decimal between 0 and 1
This calculator assumes a balanced three-phase system.

Results

Enter values and click "Calculate" to see results.
Formulas Used

Formulas will be shown here based on your system type selection.

Power Types
Power Type Symbol Description
Real Power P (kW) Power that performs useful work
Reactive Power Q (kVAR) Power that sustains the magnetic field
Apparent Power S (kVA) Vector sum of P and Q
Power Factor PF Efficiency of power usage (P/S)
Calculation Basics

Three-phase power calculations depend on whether you're measuring line-to-line (LL) or line-to-neutral (LN) voltage.

The key differences:

  • LL uses √3 (≈1.732) multiplier
  • LN uses 3 as the multiplier
  • Power Factor affects real power and reactive power
Always ensure you're using the correct voltage measurement for your system!
Important Note

"This calculator assumes a balanced three-phase system and uses standard formulas from IEEE Std 1459 and IEC 60038."

Disclaimer

"Actual power usage may vary depending on harmonics, imbalance, and other real-world conditions. This tool provides theoretical calculations for educational and planning purposes only."