Section Modulus Calculator

Find the section modulus of a rectangular beam.

Width

Height

Section modulus (mm³) 83,333.33

Formula: S = b·h² ÷ 6

Step-by-step with your numbers:

1. Values used:

2. Width = 50

3. Height = 100

5. Section modulus = 83,333.33mm³

Did we solve your problem today?

Section modulus measures a beam cross-section's resistance to bending.

The math behind it

For a rectangle, S = b·h² ÷ 6. Bending stress is bending moment ÷ S.

50 × 100 mm beam → S ≈ 83,333 mm³.

Why is height squared?

Material farther from the neutral axis resists bending much more effectively.