🟫Plywood Calculator
Find how many plywood or OSB sheets cover your walls, floor or roof.
Your surfaces
You'll need about
7 sheets
176.0 sq ft to cover (incl. 10% waste)
sq ft
176.0
sheets
7
sections
2
🛒 Shopping list
- Plywood (4×8 sheets)7 sheets
Stagger sheet seams so four corners never meet in one spot.
How it works
Add up the area of every section, divide by the sheet area (32 sq ft for 4×8, 40 sq ft for 4×10), add waste and round up.
Worked example
Two wall sections, 12 × 8 ft and 10 × 8 ft, total 176 sq ft. 176 ÷ 32 = 5.5 sheets, × 1.1 waste = 6.05, so buy 7 sheets of 4×8.
Questions people ask
4×8 is standard; 4×10 suits 9–10 ft walls with fewer seams.
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Last updated October 8, 2026. These results are friendly estimates to help you plan — always double-check before buying or making big decisions.