Deflection Checker Calculator
Check beam deflection against code limits (L/240, L/360, L/480, L/600) using δ = 5wL⁴/(384EI).
Inputs
m
kN/m
MPa
mm⁴
(1=L/240, 2=L/360, 3=L/480, 4=L/600)
Results
Actual Deflection
6.33 mm
Passes Check?
1 (1=yes, 0=no)
Allowable Deflection16.67 mm
Actual / Allowable0.38
How to Use This Calculator
- Enter the beam span in feet and the total uniform load in kips per foot.
- Input the modulus of elasticity and the moment of inertia for the selected section.
- Set the allowable deflection limit (span/240, span/360, span/480) based on the application.
- Review the Calculated Deflection in inches and the Deflection-to-Span Ratio.
- If the calculated deflection exceeds the limit, increase the section depth or pre-camber the beam.
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