A mechanical horsepower (hp) is a unit of measurement of power, the rate at which work is done or energy is used or transformed.
By definition, 1 hp = 33,000 ft·lbf/min = 550 ft·lbf/s = 745.7 W.
1 horsepowerhp = 1*2544.328396865 BTUs/hourBTU/h
1 horsepowerhp = 1*745.700000000 wattsW
1 horsepowerhp = 1*0.745700000 kilowattsKW
1 horsepowerhp = 1*745.69992140323 newton meters per secondNm/s