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The units for torque, as you stated, are Newton-meters. Although this is algebraically the same units as Joules, Joules are generally not appropriate units for torque.
How to Calculate Torque. Two Methods: Using Force and the Moment Arm Using Moment of Inertia and Angular Acceleration. Torque is best defined as the tendency of force to rotate an object about an axis, fulcrum, or pivot.You can calculate torque by using force and the moment arm (the perpendicular distance from an axis to the line of action of a force) or by using moment of inertia and angular acceleration. Ad.ethod 1 of 2: Using Force and the Moment Arm. 1. Identify the forces exerted on the body and their corresponding moment arms. If the force is not perpendicular to the moment arm being considered (i.e. it's mounted at an angle) you may need to find its components using trigonometric functions, such as sine or cosine.