Beam deflection calculator with SFD and BMD

Load a simply supported or cantilever steel beam and see it bend, with the reactions, shear force and bending moment diagrams, and the maximum deflection compared with span/360.

Works in metric or imperial units.

Learn bending moment properly

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Questions students ask

What is the maximum bending moment of a simply supported beam?

With a central point load P: PL/4 at mid-span. With a uniform load w: wL²/8 at mid-span.

What is the deflection of a simply supported beam under a uniform load?

5wL⁴/(384EI) at mid-span.

Free notes on bending moment

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