Plywood Calculator
Interior · Updated July 2026
Enter the area you're covering to find how many 4×8 sheets of plywood you need — for subfloors, sheathing, or projects.
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Estimates only. Add extra for waste and confirm with your supplier.
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How many sheets of plywood do I need?
Divide the area to cover by 32 sq ft (a 4×8 sheet), then add about 10% for waste and cuts.
Counting plywood sheets
A 4×8 sheet covers 32 sq ft. Divide the area you're covering by 32 and add about 10% for cuts and waste. For subfloors and sheathing, plan your layout so seams land on joists or studs.
Choosing a thickness
Use ¾-inch for subfloors and shelving, ½-inch for wall sheathing, and ¼-inch for cabinet backs or paneling. Thicker sheets weigh more and cost more, so match the grade and thickness to the job.
How to use this calculator
- 1Measure the area to cover in square feet.
- 2Set a waste allowance.
- 3Read the number of 4×8 sheets.
Frequently asked questions
What size is a sheet of plywood?
Standard plywood sheets are 4 feet by 8 feet, covering 32 square feet each.
How many plywood sheets do I need?
Divide the area by 32 sq ft (a 4×8 sheet) and add about 10% for waste.
What size is a sheet of plywood?
The standard sheet is 4 feet by 8 feet, covering 32 square feet.
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