Beam Load Capacity Calculator
Max safe UDL a given beam section can carry over a span — strength and deflection both.
Short spans are strength-governed, long spans deflection-governed — for an ISMB 250 the crossover sits near 5.5 m. Quoting only the strength number is how floors end up bouncy.
Formula
Beam Load Capacity Calculator is a free beam capacity 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 Beam Load Capacity Calculator
Max safe UDL a given beam section can carry over a span — strength and deflection both. The calculation implements w_str = 8σS/L²; w_def = 384EI/(1800L³) (Beam design fundamentals — IS 800). Short spans are strength-governed, long spans deflection-governed — for an ISMB 250 the crossover sits near 5.5 m. Quoting only the strength number is how floors end up bouncy.
How to use Beam Load Capacity Calculator
- 1Enter Section modulus S in cm³ (ISMB 250 = 410.5 cm³).
- 2Enter Inertia I in cm⁴.
- 3Enter Simple span in m.
- 4Enter Allowable stress in MPa.
- 5Read Strength-limited UDL, Deflection-limited UDL (L/360), Safe UDL (lower of both) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Beam Load Capacity Calculator?
- ✓Implements the standard formula — w_str = 8σS/L²; w_def = 384EI/(1800L³)
- ✓Reference cited on-page: Beam design fundamentals — IS 800
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Beam Load Capacity Calculator use?+
It computes w_str = 8σS/L²; w_def = 384EI/(1800L³), per Beam design fundamentals — IS 800. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Short spans are strength-governed, long spans deflection-governed — for an ISMB 250 the crossover sits near 5.5 m. Quoting only the strength number is how floors end up bouncy.
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 Beam Load Capacity 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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