This calculator allows you to convert from Btu (IT)/second to Horsepower (550 ft*lbf/s) and in a reverse direction. To convert from Btu (IT)/second to Horsepower (550 ft*lbf/s), enter the amount of Btu (IT)/second into the first input and to convert from Horsepower (550 ft*lbf/s) to Btu (IT)/second, enter the amount of Horsepower (550 ft*lbf/s) into the second input.