Plywood Calculator
Your estimate
Sheets14
- Area
- 384 ft²42.67 yd² · 35.67 m²
- Estimated cost
- $630
Subfloor, sheathing or roof deck — sheets of plywood or OSB with waste.
Updated 2026-10-20 · Based on: standard lumber and sheet sizes.
How to use the Plywood Calculator
- Enter the length and width of the area.
- Pick the sheet size.
- Keep 10 % waste, more for roofs with valleys.
Formula
Sheets = area ÷ sheet area × (1 + waste). A 4 × 8 sheet covers 32 ft².
Worked example
With the values preset in the calculator above:
- Length
- 24 ft
- Width
- 16 ft
- Sheet size
- 4 × 8 ft
- Extra for waste
- 10 %
- Sheets
- 14
- Area
- 384 ft² (42.67 yd²)
- Estimated cost
- $630
Frequently asked questions
How many sheets of plywood for a 24 × 16 floor?
14 sheets of 4 × 8 including 10 % waste.
OSB or plywood?
OSB is cheaper and fine for wall and roof sheathing; plywood handles moisture better for subfloors and exposed work.
What thickness for a subfloor?
23/32 in (¾ in) tongue-and-groove on joists 16 in on center is standard.
More calculators
Estimates only — check quantities with your supplier and local building code before you order.