Plywood Calculator
Updated Formulas shown
A 4×8 sheet covers 32 ft². A 20 × 20 ft floor (400 ft²) needs 14 sheets with 10% waste.
Plywood / OSB sheets
14
- Area
- 400 ft²
Works for subfloors, roof decking and wall sheathing. For roofs use roof surface area (see the roof square footage calculator).
Related calculators
- Stud CalculatorCalculate wall studs at 12, 16 or 24 inches on center, plus extras for corners and openings and plate lumber.
- Drywall CalculatorCalculate drywall sheets (4x8, 4x10, 4x12), screws, joint compound and tape for walls and ceilings.
- Roof Square Footage CalculatorTurn your house footprint and roof pitch into actual roof square footage and roofing squares.
Frequently asked questions
What thickness plywood for a subfloor?
¾ in (23/32) tongue-and-groove for joists 16 in on center; 7/8 in or thicker for 24 in spacing or tile floors.
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Estimates only. Check quantities with your supplier or contractor before ordering.