Area divided by 32, rounded up, plus a waste margin
Each standard 4 by 8 sheet covers 32 square feet, so divide your project area by 32 and round up to get bare coverage. Then add a waste factor for cuts and offcuts and round up again. If you use 4 by 10 sheets, divide by 40 instead; 4 by 12 sheets, by 48.
Sheets by project area
| Area to cover | Bare (÷ 32) | With 12% waste |
|---|---|---|
| 100 ft² | 4 | 4 |
| 200 ft² | 7 | 8 |
| 320 ft² | 10 | 12 |
| 500 ft² | 16 | 18 |
| 1,000 ft² | 32 | 36 |
Both columns round up: you can\'t buy a fraction of a sheet, so 15.6 sheets becomes 16, and 16 sheets with waste becomes 18.
Set the waste factor to match the job
- 5 to 8 percent. Simple rectangular runs with few cuts, like a plain subfloor or wall sheathing.
- 10 to 15 percent. Typical rooms with a few openings, doors, or windows. This is the sensible default.
- 15 to 20 percent. Complex layouts with lots of cutouts, angles, or curved sections, where more of each sheet ends up as scrap.
Common questions
How many square feet is a sheet of plywood?
A standard 4 by 8 foot sheet covers 32 square feet. Longer 4 by 10 sheets cover 40 square feet and 4 by 12 sheets cover 48.
How many sheets of plywood do I need for 500 square feet?
500 divided by 32 is 15.6, so 16 sheets to cover the bare area. Add a 12 percent waste allowance and round up to 18 sheets to have enough for cuts and offcuts.
How much waste should I add for plywood?
Ten to fifteen percent covers most jobs. Use around 8 percent for simple rectangular layouts and 15 to 20 percent for rooms with many cutouts, angles, or complex shapes.
