This calculator will determine the force required to change the angle of each srping contacting leg to another. The definition of torsion spring rate is the amount of force per 360 degrees of radial travel. Torsion force is typically noted in pounds or newtons based on English or metric measurements. This can be further broken down into the amount of force per degree by simply dividing by 360 degrees.
The torsion spring rate per degree will be useful in determining the amount of force required to torque your spring a particular amount of degrees, for example 90 degrees.