
Torque Torque is the turning moment or twisting effort in a shaft or an object that tends to cause rotation. It is the measure of rotational force and is expressed in footpounds.
Torque = force in pounds x radius in inch or foot
Torque (poundinch) = 63,025 x hp rpm
Torque (poundfoot) = 5,252 x hp rpm
Horsepower = TORQUE (lbin) x rpm 63,025
Horsepower = TORQUE (lbft) x rpm 5,252



To compute torque at any horsepower, multiply torque values above by horsepower required.
Example: 10 hp @ 580 rpm, torque = 10 x 109, or 1,090 lbins 1/2 hp @ 100 rpm, torque = 1/2 x 630, or 315 lbins
For intermediate speeds, approximate the torque from table, or apply standard torque formula above.



