Beam sizing (simply supported, UDL)

Max moment and required section modulus for a simply supported beam under a uniform load.

Span (m)Uniform load w (kN/m)Allowable stress (MPa)

Max moment67.5 kN·m

Required section modulus409.09 cm³

Estimate only — Simply supported; uniformly distributed load; elastic design; M = wL²/8. Not a substitute for detailed design.