The calculation is designed for a geometrical design and strength check of common chain transmissions using roller chains. Application is developed in MS Excel, is multi-language, supports Imperial and Metric units and solves the following tasks: - Selection of a power suitable type of chain. - Selection of an optimum transmission alternative regarding power, geometry and weight. - Calculation of geometric, strength, safety and operational parameters. - Calculation of power parameters and axis loads. - 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 application includes corresponding databases of roller chains. The calculations use data, procedures, algorithms and data from ANSI/ASME, ACA (American Chain Association) ISO, DIN, BS and JIS. Used standards: ANSI/ASME B29.1M (Dec2001), ANSI/ASME B29.3, DIN 8187, DIN 8181, DIN 8181, DIN 8164, DIN 8150, ISO R606, ISO 1275, BS 228, JIS B1801, JIS B1803.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