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How to Calculate Rotational Torque

by Ryan Menezes

Rotational torque measures a force's tendency to rotate an object. To calculate it, you need to know how large the force is and the length between the axis and the point of force application.

Step 1

Convert force to Newtons (N). To convert pounds to Newtons, multiply by 4.45. For example, if force equals 100 lbs.: 100 * 4.45 = 445 N 100 lbs. of force is equal to 445 Newtons.

Step 2

Convert length to meters. To convert feet to meters (m), multiply by 0.3. For example, if length equals 2 feet: 2 * 0.3 = 0.6 meters 2 feet of length is equal to 0.6 meters.

Multiply force by length to calculate torque, which is measured in Newton meters (Nm): 445 * 0.6 = 267 Nm


  • If you don't have a calculator handy, enter your formula into your computer's calculator or a Google search bar.

Items you will need

  • Calculator or computer

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