the calculation is intended for the purposes of geometric and strength designs of spiral cylindrical torsion springs made of wires and rods in circular sections, cold formed, loaded with a static or cyclic loading. application is developed in ms excel, is multi-language and supports imperial and metric units and solves the following main tasks: - automatic design of the spring. - selection of the optimal design of the spring with respect to strength, geometry and weight. - static and dynamic strength tests. - support for cold formed springs and hot formed springs - calculation of the working forces of a spring with known production and mounting dimensions. - calculation of mounting dimensions for known spring loading and production parameters. - the application includes a table of commonly used spring materials according to iso, astm/sae, din, bs, jis and others. - support of 2d cad (autocad, autocad lt, intellicad, ashlar graphite, turbocad) and 3d cad in full calculation package (autodesk inventor, solidworks, solidedge, pro/e). the calculation is based on data, procedures and algorithms from specialized literature and the standards en 13906-2, and din 2088.this module is a part of mitcalc - mechanical and technical calculation package for gear, belt and chain drives, springs, beam, shaft, bolt connection, shaft connection, tolerances and many others.