Deflection Calculator
Calculate beam and slab deflections under various loading conditions. Check against allowable deflection limits per building codes (L/250, L/360, etc.).
Member Dimensions
Material & Loading
Formula: δ = 5wL⁴/384EI
General floors, roofs
Enter member dimensions and loading to calculate deflection
Notes:
- Calculations use gross (uncracked) section properties
- Long-term deflection may be 2-3× elastic deflection
- Cracked section analysis may give higher deflections
- Consider camber for beams with significant deflection
- Verify with detailed structural analysis for critical members
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IMPORTANT DISCLAIMER
This calculator provides PRELIMINARY ESTIMATES ONLY and is intended for planning and budgeting purposes. Results should NOT be used for final structural design or construction without verification by a licensed Professional Engineer (PE) or Chartered Engineer (CEng).
By using this tool, you acknowledge that:
1. All calculations are indicative and may not account for site-specific conditions, load combinations, or local code requirements.