Power Factor Calculator — AC Circuit

Power factor is a critical concept in AC electrical engineering that describes how effectively a circuit uses the power supplied to it. A power factor of 1.0 means all the supplied power is converted to useful work, while a lower power factor means more current must be drawn to deliver the same real power, increasing losses and energy costs.

Inductive loads (motors, coils) cause the current to lag behind the voltage in phase, producing a lagging power factor. Capacitive loads cause the current to lead. Power factor correction — typically by adding capacitor banks to inductive systems — shifts the phase back toward unity, reducing apparent power demand and improving grid efficiency.

Utilities typically bill large industrial consumers based on apparent power or impose penalties for low power factor, making power factor analysis an important part of electrical system design and energy audits. This calculator helps engineers, electricians, and facility managers quickly evaluate and improve power system efficiency.