the calculation is intended for the purposes of geometric and strength designs of helical tension cylindrical springs made of wires and rods of circular sections, loaded with static loading. . application is developed in ms excel, is multi-language, supports imperial and metric units and solves the following main tasks: - automatic design of the spring. - selection of an optimal alternative of the spring design in view of strength, geometry and weight. - strength check of the spring. - support for cold formed springs and hot formed springs - calculation of working forces of a spring of known production and mounting dimensions. - calculation of mounting dimensions for a known loading and production parameters of the spring. - 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 standards en 13906-2, din 2089-2, din 2097.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.