OSB Calculator
Oriented strand board sheathing commonly ships in 4×8 panels. Enter area for sheet count.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Net wall or roof deck area before openings if you already deducted them.
What the math is doing
Sheets = ceil((sq ft × (1+waste)) ÷ 32).
Frequently asked questions
Roof vs wall rating?
Use APA grade stamps appropriate for exposure.
H-clips?
Counted per seam, not here.
ZIP system panels?
Coverage per sheet may differ from 32.
Thickness?
Does not change sheet count for area-only model.