Three-Phase Power Calculator
Real power for a balanced three-phase electrical load.
Enter your values
ⓘ Live results
Results
- Real power
- 37.41 kW
- Apparent power
- 41.57 kVA
- Reactive power
- 18.12 kVAR
Quick answer
P = sqrt(3) x V_line x I_line x power factor.
P = sqrt(3) V I pf
How to use the Three-Phase Power Calculator
- 1Enter the line-to-line voltage and line current of the three-phase circuit.
- 2Enter the load's power factor (1.0 for purely resistive loads).
- 3Read the real, apparent and reactive power.
Worked example
Using the values the calculator loads with:
Inputs
- Line voltage480 V
- Line current50 A
- Power factor0.9
Results
- Real power37.41 kW
- Apparent power41.57 kVA
- Reactive power18.12 kVAR
Frequently asked questions
Why the square root of 3?
It accounts for the 120-degree phase offset between the three phases in a balanced system.
What is reactive power?
Power that oscillates between source and load without doing real work, caused by inductive or capacitive loads.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.