Three-Phase Power Calculator
Calculate power components for three-phase electrical systems.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter the line-to-line voltage, line current, and power factor. The calculator shows the real power, reactive power, apparent power, and phase voltage for a balanced three-phase system.
About Three-Phase Power
Three-phase electrical power is the standard for generation, transmission, and distribution of electricity worldwide. It is more efficient than single-phase power and provides a smoother power delivery. The real power equals sqrt(3) times line voltage times line current times power factor. Three-phase systems are used in industrial motors, large HVAC systems, data centers, and electric vehicle charging stations.
Frequently Asked Questions
What is three-phase power?
Three-phase power uses three alternating currents, offset by 120 degrees, to deliver power more efficiently than single-phase. It is standard for industrial and commercial electrical distribution.
What is the sqrt(3) factor?
The sqrt(3) factor (approximately 1.732) arises from the 120-degree phase relationship between the three phases. It converts between line and phase quantities in balanced three-phase systems.
What is the relationship between line and phase voltage?
In a star (wye) connection, line voltage = sqrt(3) times phase voltage. In a delta connection, line voltage equals phase voltage but line current = sqrt(3) times phase current.