How to use section properties
Enter dimensions in millimeters. Iₓ and Iᵧ describe resistance to bending about the centroidal axes; section modulus Sₓ is Iₓ divided by the farthest-fiber distance. For a symmetric rectangle, Iₓ = bh³/12.
Assumptions
These formulas apply to idealized, homogeneous sections. Check dimensions and use a composite-section calculation for nonstandard built-up shapes.