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* A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts. * A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9,809.5 watts. * One horsepower for rating electric motors is equal to 746 watts.
First, a few equations to help you calculate your horsepower: So . For electric motors, power or horsepower can be calculated from the torque and speed. For example, if you have a motor rated for 3,000 RPM and 6 in-lbf then the horsepower is calculated below.63,025 is a constant when using RPM for speed and in-lbf for torque units.hough horsepower units are a derivative of the 33,000 ft-lbf/min, it is not critical to understanding how to calculate motor horsepower for speed and torque. Another common unit of power that motors are rated in is watts. The conversion from watts to horsepower is 745.7 watts = 1 hp.