Plywood Calculator
Calculate the plywood sheets needed to cover a floor, wall or roof.
Enter your values to see the result.
Continue your work
- Roofing Calculator — Plan roof sheathing.
- Board Foot Calculator — Price solid lumber.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Plywood Calculator
Calculate the plywood sheets needed to cover a floor, wall or roof.
- 1 Enter the length and width of the area.
- 2 Choose the sheet size and waste.
- 3 Read the sheets needed and cost.
Example and practical tips
A 20 × 12 ft floor needs 8 sheets of 4 × 8 plywood, or 9 with 10% waste.
Frequently asked questions
What size is a plywood sheet?
Usually 4 × 8 ft (1220 × 2440 mm).
How much waste should I allow?
10% for simple rectangles, more for complex shapes.
Report an issue
Something broken or not quite right? Tell us and we will look into it.