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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.
1 Convert Horsepower to Other Measures - 1 horsepower = 550 foot-pounds/second, 33,000 foot-pounds/minute, 42.44 Btu/minute, and .7456999 * kilowatts.2  Therefore depending on what you are trying to convert horsepower to, multiply the total from Step 2 by the appropriate measure. Convert Horsepower to Other Measures - 1 horsepower = 550 foot-pounds/second, 33,000 foot-pounds/minute, 42.44 Btu/minute, and .7456999 * kilowatts.