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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 foot-pounds.
Torque = force in pounds x radius in inch or foot
Torque (pound-inch) = 63,025 x hp
rpm
Torque (pound-foot) = 5,252 x hp
rpm
Horsepower = TORQUE (lb-in) x rpm
63,025
Horsepower = TORQUE (lb-ft) x rpm
5,252
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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 lb-ins
1/2 hp @ 100 rpm, torque = 1/2 x 630, or 315 lb-ins
For intermediate speeds, approximate the torque from table, or apply standard torque formula above.
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