"RECTBEAM" is a spreadsheet program written in MS-Excel for the purpose of analysis/design of rectangular beam or column sections. Specifically, the required flexural reinforcing, ultimate moment capacity, bar spacing for crack control, moments of inertia for deflection, beam shear and torsion requirements, and member capacity for flexure (uniaxial and biaxial) with axial load are calculated. There is also a worksheet which contains reinforcing bar data tables. This version is based on the ACI 318-05 Code.