Bending Stress Calculator
σ = M/S with utilisation against the material's allowable stress.
The flexure formula assumes plane sections and linear elasticity — valid until first yield, which is exactly where allowable-stress design stops.
Formula
Bending Stress Calculator is a free bending stress for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Bending Stress Calculator
σ = M/S with utilisation against the material's allowable stress. The calculation implements σ = M/S (Flexure theory; IS 800 WSD). The flexure formula assumes plane sections and linear elasticity — valid until first yield, which is exactly where allowable-stress design stops.
How to use Bending Stress Calculator
- 1Enter Bending moment in kN·m.
- 2Enter Section modulus in cm³.
- 3Enter Allowable stress in MPa (0.66·f_y for compact steel (WSD)).
- 4Read Bending stress, Utilisation instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Bending Stress Calculator?
- ✓Implements the standard formula — σ = M/S
- ✓Reference cited on-page: Flexure theory; IS 800 WSD
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Bending Stress Calculator use?+
It computes σ = M/S, per Flexure theory; IS 800 WSD. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
The flexure formula assumes plane sections and linear elasticity — valid until first yield, which is exactly where allowable-stress design stops.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Bending Stress Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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