Plywood Calculator
Determines the number of plywood sheets needed for subfloor, sheathing, or formwork
Length of the area in feet
Width of the area in feet
Standard plywood sheet dimensions
Extra sheets to account for cuts and waste
Enter dimensions to calculate
Minimum number of sheets
Sheets needed including waste allowance
Frequently Asked Questions
What are standard plywood sheet sizes?
The most common plywood sheet is 4x8 feet (32 square feet). Other standard sizes include 4x10 feet (40 square feet) and 4x12 feet (48 square feet). Half sheets (4x4) and quarter sheets (2x4) are also available at some retailers.
How thick should plywood be for subfloor?
Residential subfloor typically uses 3/4-inch (23/32) tongue-and-groove plywood over joists spaced 16 inches on center. For 24-inch joist spacing, use 7/8-inch or 1-1/8-inch plywood. Thicker plywood reduces floor bounce and squeaks.
How much waste should I plan for plywood?
Plan for 10% waste on simple rectangular areas. Complex shapes, angled cuts, or areas with many openings may need 15-20% extra. Plywood offcuts can often be used for smaller sections, so organize your cut layout before starting.
What is the difference between plywood grades?
Plywood is graded by face quality. A-grade has a smooth, sanded face suitable for visible surfaces. B-grade has minor repairs. C-grade has knots and splits. D-grade is rough and used for sheathing. CDX is the most common construction grade, with C and D faces and exterior glue.
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