Table Sag Calculator
Calculate maximum safe span for table tops and shelves to prevent sagging
About this calculator
The Table Sag Calculator determines the maximum safe span for table tops, shelves, and other horizontal surfaces to prevent unsightly sagging and structural failure. This engineering tool considers material properties, thickness, load requirements, and safety factors to ensure your furniture maintains its appearance and functionality over time. Essential for woodworkers, furniture makers, and DIY enthusiasts planning custom tables, floating shelves, or storage solutions that need to support weight without deflecting beyond acceptable limits.
How to use
Enter your material type (wood species, plywood, MDF, etc.), board thickness, expected load weight, and desired safety margin. The calculator will compute the maximum recommended span between supports to prevent excessive sagging. Use the results to determine proper support spacing for legs, brackets, or other structural elements.
Frequently asked questions
What is considered excessive sagging for furniture?
Generally, deflection should not exceed 1/360th of the span length for furniture applications to maintain structural integrity and appearance.
Does wood grain direction affect sag calculations?
Yes, wood is significantly stronger along the grain. Always orient boards with grain running parallel to the span for maximum strength.
Can I use this calculator for glass table tops?
This calculator is designed for wood materials. Glass requires specialized structural analysis due to different failure modes and material properties.