Calculate the number of plywood or OSB sheets needed for roof sheathing. Accounts for standard 4×8 sheet size and waste.
Enter your values below
Total roof area in square feet.
Area per sheet (4×8 = 32 ft², 4×10 = 40 ft², 4×12 = 48 ft²).
How this calculator works
Number of sheets equals roof area times waste factor divided by the area of one sheet (typically 32 ft² for 4×8 panels).
Common questions about this calculator
