Three-Phase Power Calculator
Calculate Power (kW), Voltage (V), or Current (Amps) for balanced 3-phase systems. Essential for industrial motors, large generators, and commercial power planning.
System Parameters
Calculation Formula
*Formulas use Line-to-Line Voltage (VLL) and √3 ≈ 1.732.
Calculated Power
Common 480V 3-Phase Loads
| Power (kW) | Current @ 480V (0.8 PF) | Apparent Power (kVA) |
|---|---|---|
| 10 kW | 15.0 A | 12.5 kVA |
| 25 kW | 37.6 A | 31.25 kVA |
| 50 kW | 75.2 A | 62.5 kVA |
| 100 kW | 150.4 A | 125.0 kVA |
| 250 kW | 375.9 A | 312.5 kVA |
*Current approximated using standard generator PF of 0.8.
Understanding 3-Phase Power
Three-phase power uses three alternating currents that are out of phase by 120 degrees. This provides constant power delivery, making it ideal for heavy loads like large motors.
The $\sqrt{3}$ Factor
In three-phase calculations, the square root of 3 (approx 1.732) is a critical constant. It relates the Line-to-Line voltage to the Line-to-Neutral voltage and total power capacity.
Power (kW) = (Volts × Amps × PF × 1.732) / 1000