Beam Deflection Calculator
How to calculate beam deflection
- Choose the support and load case, and enter the span and load.
- Choose the material, or Other to enter the elastic modulus.
- Enter the section as a rectangle or as a moment of inertia to see the deflection and bending moment.
Frequently asked questions
What deflection is acceptable?
Building codes often limit floors to span / 360 under live load and roofs to span / 240. The span / deflection figure lets you compare.
Does it check strength?
No. It gives deflection and bending moment only; check stresses and connections with the right design standard.
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