Geometric design and strength check of worm gear. Application is developed in MS Excel, is multi-language and supports Imperial and Metric units and solves the following main tasks:- Calculation of gearing dimensions. - Automatic transmission design with minimum input requirements. - Design for safety coefficients entered. - Calculation of a table of proper solutions. - Calculation of complete geometrical parameters. - Calculation of strength parameters, safety check. - Gearing design for precise centre-line distance. - Auxiliary calculations (heating, shaft design). - Support of 2D and 3D CAD systems. - 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 calculations use procedures, algorithms and data from standards ANSI, ISO, DIN, BS and specialized literature. Used standards: ANSI/AGMA 6022-C93 (Revision of AGMA 341.02), ANSI/AGMA 6034-B92 (Revision of ANSI/AGMA 6034-A87), DIN 3996, DIN 3975-1, DIN 3975-2 and others. 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.