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