Beam Deflection Calculator
Calculate beam deflection under uniform or point loads. Check if deflection meets building code requirements.
Beam & Load Details
Load Type:
Material:
12 ft
4 ft30 ft
ft
500 lb/ft
50 lb/ft2,000 lb/ft
lb/ft
in
in
Common Sizes:
Maximum Deflection
0.7218"
Deflection Ratio: L/199
Floor Limit (L/360)
Max: 0.4000" - FAIL
Roof Limit (L/240)
Max: 0.6000" - FAIL
📊Max Moment
9000 ft-lb
⚡Max Stress
2164 psi
📐Moment of Inertia
230.84 in⁴
📏Section Modulus
49.91 in³
Deflection Limits Reference
L/360
Floor live loads, typical residential
L/240
Roof live loads, total floor load
L/180
Plaster ceilings, brittle finishes
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
📚
Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.