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Wood Shelf Sag Calculator

Estimate immediate elastic deflection of a simply supported shelf under a uniform load.

Prefilled values are examples. Replace them with measurements and current costs for your project.

Inputs

Shelf geometry and load

Range: at least 0.01 in

Range: at least 0.01 in

This is the rectangular section width perpendicular to the span.

Range: at least 0.01 in

Range: at least 0 lb

Enter the total load spread evenly over the full span, not a single point load.

Range: at least 0.01 psi

Use a value appropriate to the material, grade, moisture condition, and loading direction.

Range: at least 0.01 psi

Use a value appropriate to the material and section orientation.

Result

Immediate bending deflection
0.0593 in
Immediate shear deflection
0.0005 in
Total immediate deflection
0.0598 in

Formula

Immediate bending deflection
—
Immediate shear deflection
—
Total immediate deflection
—

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Results are planning aids based on the inputs and assumptions shown. Verify dimensions, stock sizes, hardware clearances, kerf, and current prices against your project before cutting or quoting.