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www.homeexpertly.comPlywood / OSB Sheet Count Calculator — Estimate 4×8 Sheets & Coverage
Figure out how many sheets of plywood or OSB you need for walls, floors, or roof sheathing. Enter each surface's dimensions, pick your sheet size, add a waste factor, and get a full sheet count, coverage area, and a downloadable takeoff PDF.
Estimates for planning only. Actual sheet counts vary by layout, orientation, cutting waste, and code. Always confirm against your plans before ordering material.
1
Sheet & material
OSB
oriented strand
Plywood
CDX / sheathing
2
Surfaces to cover
Type
Length (ft)
Width (ft)
Qty
Enter each wall, floor, or roof plane as length × width (or height). Use Qty for identical surfaces. For roofs, use the sloped (rafter) length, not the flat span.
3
Deductions & waste
ft²
Optional — leave 0 to sheathe over openings
%
0%15%30%
Total sheets required
— sheets
Enter your surfaces and click Calculate
Sheets
—
incl. waste
Net area
—
ft² to cover
Coverage
—
ft² provided
Area & sheet breakdown
Surfaces—
Gross area—
Deductions—
Net area—
Sheet size—
Area per sheet—
Sheets (exact)—
Waste sheets—
Material summary
Gross area
—
Deductions
—
Net area
—
Sheets (exact)
—
Waste sheets
—
Total sheets
—
Surface takeoff
| Surface | Dimensions | Area | Sheets |
|---|---|---|---|
| Run the calculator to see your takeoff | |||
Visualizations
Coverage area by surface