Plywood Calculator
Count 4×8 plywood sheets for a surface area.
Enter the dimensions of the surface you're covering — a floor, wall, or roof — to get the number of 4×8 plywood or OSB sheets needed, including a waste allowance for cuts.
How it works
A 4×8 sheet covers 32 square feet. Divide the surface area by 32, add a waste allowance for cuts and offcuts, and round up. Stagger the seams when sheathing for strength.
Frequently asked questions
How many sheets of plywood do I need?
Divide the surface area by 32 (a 4×8 sheet), add waste, and round up. A 12×10 ft surface needs about 5 sheets with 10% waste.
How many square feet is a sheet of plywood?
A standard 4×8-foot sheet covers 32 square feet.
How much waste should I add for plywood?
About 10% for most jobs, more if the surface has many openings or angled cuts.
Is this calculator free and private?
Yes. Every CubicCabin calculator runs entirely in your browser, so the numbers you enter are never uploaded or stored. There's no sign-up, no limits, and it keeps working even if you lose connection after the page loads.