Beam Load Capacity Calculator

Inputs

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Support and loading case used for maximum bending moment.
Clear span or cantilever length for the selected case.
mm
Elastic section modulus about the bending axis.
cm³
Material allowable or design bending stress before applying the safety factor.
MPa
Design stress = allowable stress / safety factor.
Total point load or total uniform load to compare against the allowable load.
N

Results

Default result
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Allowable total load(F_allow)
8,000N
Pass

8 kN · 1,798 lbf

Derived from M_allow = (allowable stress / safety factor) * S.

Load that reaches design bending stress.

Also computed

Applied utilization(U)0.25

Applied bending stress(sigma)25MPa

Required section modulus(S_req)5cm³

Allowable moment(M_allow)2,000N·m

Applied moment(M)500N·m

Allowable load / span(w_eq)8N/mm

Method notes 3 notes
  • This is an elastic bending-stress capacity check using sigma = M/S. It does not check deflection, shear, bearing, web crippling, local buckling or lateral-torsional buckling.
  • Uniform-load cases use total load W across the span. The load/span output is the equivalent uniform line load for quick comparison.
  • Use the section modulus about the actual bending axis and apply code-specific resistance factors where required.

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