Calculate three-phase power and line current, including the √3 relationship.
In a balanced star system the line voltage is √3 times the phase voltage, which is where the √3 factor in the power equation comes from. Three-phase delivers three times the power of one phase on only 1.73 times the voltage. Three-phase supply carries far more power per conductor than single phase, which is why all significant industrial loads use it.
Three Phase Power
P = √3 V_L I_L cos φ; V_phase = V_L ÷ √3
P = √3 V_L I_L cos φ; V_phase = V_L ÷ √3 In a balanced star system the line voltage is √3 times the phase voltage, which is where the √3 factor in the power equation comes from. Three-phase delivers three times the power of one phase on only 1.73 times the voltage.
Three-phase supply carries far more power per conductor than single phase, which is why all significant industrial loads use it.
This calculator takes 3 inputs: Line-to-line voltage, Line current, Power factor. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.