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.