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Beam Load Calculator
Estimate safe uniformly distributed load (UDL) capacity of an RCC beam using simplified IS 456:2000 approach
Structural
📋IS 456:2000 — Clause 22 (Effective Span) & Clause 23 (Slenderness Limits)
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Estimation tool only. Results are indicative — not a substitute for professional engineering design or site-specific survey. Always verify with a qualified civil, structural, or MEP engineer before ordering materials or commencing construction.
Calculate
Results are estimates only. Verify with a qualified engineer before use.
Formula
Moment of Resistance (simplified): Mu_lim = 0.138 × fck × b × d² (limiting moment for Fe-415 steel) For simply supported beam with UDL: Mu = w × L² / 8 Safe UDL: w = 8 × Mu_lim / L² (kN/m) Where fck = characteristic compressive strength (N/mm²) b = beam width (mm), d = effective depth ≈ 0.85 × total depth (mm)
fckConcrete characteristic compressive strength (N/mm²)
bBeam width (mm)
dEffective depth (0.85 × overall depth) (mm)
LEffective span (m)
0.138IS 456 limiting moment coefficient for Fe-415
Mu_limLimiting moment of resistance (kN·m)
Reference Standard
IS 456:2000 — Clause 22 (Effective Span) & Clause 23 (Slenderness Limits)
Practical Tips
- •This is a preliminary sizing tool only — always engage a structural engineer for final design and drawing approval.
- •Provide adequate lateral restraint (via slab or bracing) to prevent lateral torsional buckling in longer beams.
- •IS 456:2000 mandates minimum 2 nos. of bars at top and bottom throughout beam length for nominal reinforcement.