Before diving into the calculator, it's essential to understand the basics of DIN 5480 splines. The standard defines two main types of splines: involute splines and straight-sided splines. Involute splines have an involute profile, which provides a smooth and continuous contact between the spline and the mating part. Straight-sided splines, on the other hand, have a straight profile and are used for applications where the torque transmission is relatively low.