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In theory one horse power equals 746 watts. They are both basic measures of power.

A 1 HP motor however draws more than 746 watts because to give a mechanical output of 1 HP/746 watts at the shaft, the motor has to draw more than 746 watts of electric power to cover losses in caused by resistance in the windings and the iron core of the motor, and friction in the bearings.

A typical efficiency for a motor would be 90% so that the electric power used would be 829 watts.

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For clarification in all electrical calculations regarding horsepower, 746 watts per horsepower is used.

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11y ago

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