the application is designed for calculations of straight, maximum three times static indefinite beams with constant axis-symmetrical profiles. application is developed in ms excel, is multi-language, supports imperial and metric units and solves the following main tasks: - simple definition of the type of beam and its loading with visual check. - calculation of area characteristics of 20 types of cross sections. - calculation of reactions in supports. - calculation of minimum / maximum bending moment, stress and deflection of the beam. - calculation and graphic illustration of the moment, stress, deflection and bending angle of the loaded beam. the application includes a table of materials and a table of area characteristics of w, s, c, l profiles acc. to ansi/aisc and i, u, l a t profiles acc. to din/iso. used standards: din 1025, 1026, 1028, 1029, 1024, aisc w, s, c, l, luthis 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