Beam Deflection Calculator

Find deflection under center point load or uniform distributed load.

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Formula

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Formulas

δ = FL³ / 48EI

Simply supported beam, center point load

δ = 5wL⁴ / 384EI

Simply supported beam, uniform distributed load

Beam Deflection

For simply supported beams. E values: Steel 200 GPa, Aluminum 69 GPa, Wood 8-14 GPa. Design limit: typically L/360 for floor beams, L/240 for roof beams.