1 Horsepower is 33,000 lb/ft/min.

The complete formula to CALCULATE Horsepower is:

HP = torque x RPM x (2 x pi)/33,000.

The 2 variables are torque and RPM, 2 x pi and 33,000 are constant. 33,000/2 x pi = 5252. Hence the short equation. Login to read more.