Torque is a measurement of the force applied to an object that will be rotated, such as the force applied to a nut as it is screwed onto a bolt by a wrench. There are many precision bolts that must be tightened to a precise amount of torque to ensure safe and accurate performance. A torque wrench is a specialized piece of equipment that can measure the amount of torque applied to a component such a nut, but torque can also be calculated using simple measurements and a calculator.
Things You'll Need
 Tape measure or ruler
 Calculator
 Wrench

Convert all measurements into pounds and feet. For instance, if yards are used to measure length, divide by 3 to find the amount of feet. If tons are used for weight, multiply by 2,000 to find the amount of pounds.

Find the force applied to the object that will be exerted in a circular manner. For instance, if you were apply 50 lbs. of force to the end of a wrench, the number to note is 50.

Find the length of the object being used to exert circular force. For example, if you were to apply 50 lbs. of force onto a wrench that has a 5footlong shaft, the length to note is 5 feet.

Multiply the amount of force applied with the length of the object exerting that force. For example, if you apply 50 lbs. of force onto a wrench with a 5footlong shaft, you would multiply 50 by 5 to get 250.

Express the resulting figure as "poundfeet of torque." For example, 250 poundfeet of torque.
Tips & Warnings
 For extremely accurate measurements of torque, a recently calibrated torque wrench can be a big help. There are numerous types of torque wrenches—beam, deflecting beam, calibrated clutch and electronic—that can be used for specific types of jobs and amount of accuracy needed.
 To avoid injury, always wear safety goggles and work gloves before working with tools like wrenches.
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References
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