Professional structural engineering toolkit. Calculate beam deflection, moment of inertia, and bending stress for steel and wood members. Accurate tools for civil and mechanical engineers.
For a simply supported beam with a point load at the center, the formula is δ = PL³ / 48EI. Our tool handles various load and support conditions automatically.
Young's Modulus (E) depends on the material. Steel is approx 200 GPa, Aluminum 70 GPa, and typical wood (Douglas Fir) is around 11-13 GPa.
It is a standard building code requirement stating that a floor beam should not deflect more than 1/360th of its span length to prevent cracks in plaster and occupant discomfort.