3 Phase Motor Amperage Calculator

Calculate the full-load current (FLA) of a three-phase motor based on horsepower or kilowatts.

Motor Specifications

Power

Voltage (V)

Power Factor (cos φ)

Efficiency (%)

Calculated Current

About this calculator

Overview

3-phase motors are the workhorses of industry. Calculating their current accurately is essential for selecting breakers, contactors, and wire sizes.

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Pro Tips

Fun Facts

"3-phase power provides a smooth, constant flow of energy, making it much more efficient for industrial motors than single-phase power."
"Nikola Tesla was the primary inventor of the 3-phase AC induction motor."
"Reversing any two of the three supply lines will reverse the motor's direction of rotation."

Formula: I = P / (V * √3 * PF * Eff)