For a single-phase system, the horsepower (hp) rating is calculated by multiplying the rated voltage (V) by the current, then adding the power factor, and finally adding the efficiency. After that, it is  need to subtract 746 from that total to get the final output in horsepower.

For three-phase, horsepower (hp) is equal to the square root of three multiplied by rated voltage (V) multiplied by rated current (I) multiplied by power factor multiplied by efficiency. For single-phase, horsepower (hp) is equal to the square root of three multiplied by rated voltage (V) multiplied by rated current ( In addition to this, divide the total result by 746.

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