Plywood Calculator
Find how many plywood or OSB sheets cover a floor, wall or roof area, with waste and the cost.
Change the values and press Calculate to work out your own figures.
Enter the area's length and width and the sheet size.
Show the working
- sheets = area ÷ sheet area, rounded up
How to use it
Enter the area's length and width and the sheet size.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
sheets = area ÷ sheet area, rounded up
Thickness
Subfloors are commonly 23/32 in (3/4 nominal) tongue-and-groove; walls 7/16 in OSB or 1/2 in plywood.
Questions
How many sheets of plywood for 800 sq ft?
25 sheets of 4 × 8, before waste.
Formulas
sheets = area ÷ sheet area, rounded up
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.