Rotating Mass Torque Equation and Calculator

General Engineering and Design Data Menu
Industrial Electric Motor Application, Design and Installation Menu

To determine a fan or blowers horsepower use the following equation.


Torque Formula fan or blowers horsepower


WK^2 Formula

Open Calculator


T = Required Torque, lb-ft
WK2 =   Mass Moment of Inertia of load to be accelerated  lb-ft2
(See Mass moment of inertia calculations)
Change of speed, rpm
t =  Time to accelerate the load, seconds
W = Weight of object, lb
R = Radius of cylinder, ft