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OSB Weight Calculator

Calculate OSB weight instantly based on dimensions and thickness. Get accurate estimates for standard and custom sheet sizes using 40 lb/ft³ density.

Ask a question to get your result

Frequently Asked Questions

Common questions about osb weight.

A standard 4x8 sheet of 7/16" OSB weighs approximately 47 pounds. Thicker sheets like 23/32" weigh around 71 pounds. Weight varies slightly by manufacturer and moisture content.

OSB (Oriented Strand Board) has an average density of 40 pounds per cubic foot. This can vary between 38-42 lb/ft³ depending on the manufacturing process, wood species used, and resin content.

OSB is typically slightly lighter than plywood of the same thickness. OSB at 40 lb/ft³ compares to plywood at 42-45 lb/ft³, though the difference is minimal for most applications.

Moisture can increase OSB weight by 10-20% or more. Fresh OSB from the factory has about 5-8% moisture content, but exposure to humid conditions or rain can significantly increase weight temporarily.

Standard OSB thicknesses include 7/16" (wall sheathing), 15/32" and 19/32" (roof sheathing), 23/32" (flooring), and 3/4" (heavy-duty flooring). Each thickness is engineered for specific structural applications.

How to Calculate

To calculate OSB weight, enter the length, width, and thickness of your sheet, plus the quantity needed. The calculator converts dimensions to feet, computes the volume (length × width × thickness), and multiplies by OSB's standard density of 40 lb/ft³. For example, a 4' × 8' × 7/16" sheet has a volume of 1.19 cubic feet, resulting in a weight of 47.4 pounds. Adjust for multiple sheets by entering your quantity.

Formula & Method

Weight = Length (ft) × Width (ft) × Thickness (ft) × Density (40 lb/ft³) × Quantity

Volume (ft³) = Length × Width × Thickness (all in feet)
Total Weight (lb) = Volume × 40 × Quantity

Sources & References

https://www.apawood.org/
https://www.fpl.fs.fed.us/

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