Subfloor Plywood Calculator
Plywood for a subfloor comes in full sheets. This adds an allowance for cuts to your floor area, then rounds up to whole sheets. Change any number and the count follows.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Add the waste allowance to the floor area, then divide by the area of one sheet. Round up to the next whole sheet.
Cuts at walls, stairs and openings leave pieces that cannot be reused in the same room. Many people allow 5 to 10 percent for that.
Worked example
A floor of 480 ft² with 10% extra for cuts needs 528 ft² of plywood, which is 17 sheets sheets.
Questions
Is a 4 by 8 foot sheet the usual size?
In the US, 4 by 8 feet, about 32 square feet, is the common size. Check the size printed on the sheets you buy.
Does this count glue or fasteners?
No. It counts the sheets only. Plan your nails or screws from the product's own spacing guide.
Do I need two layers?
This counts one layer. For a second layer, run the numbers again with the same floor area.
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