Square Tube Deflection Chart
Square tube deflection depends on span, load, support condition, modulus and moment of inertia. A chart is only useful when those assumptions match.
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Why charts disagree
Charts assume a load case, span, steel modulus and tube geometry. Change any of those and deflection changes.
Core formula shape
deflection is proportional to load * span^3 / (E * I)
Best workflow
Use charts for screening, then enter actual tube size, wall thickness, span and load in the calculator.
Related pages
- Square tube deflection calculator - run the actual tube beam check.
- Square tube weight calculator - estimate HSS weight before stiffness checks.
- Section modulus calculator - calculate I and S for common sections.
- Beam deflection calculator - general beam formulas and load cases.