Bending Stress Calculator

Find bending stress from moment and section modulus.

Bending stress (MPa) 80

Formula: σ = M ÷ S

Step-by-step with your numbers:

1. Values used:

2. Bending moment (M) = 4,000 N·m

3. Section modulus (S) = 0.0001

5. Bending stress = 80MPa

Did we solve your problem today?

Find the bending (flexural) stress in a beam.

The math behind it

σ = bending moment ÷ section modulus. Compare with the material's allowable stress.

4,000 N·m, S = 5e-5 → 80 MPa.

Allowable stress?

Steel ~165 MPa yield; wood ~8–15 MPa; must stay below it.