OSB sheathing calculator: how many sheets
The area, the sheet size and a waste allowance give the number of whole OSB panels or boards for a wall or a roof.
Your figures
Result
The figures changed. Press “Calculate again” to see the new result.
Building material catalogue — 34 materials in the catalogue
How we calculate it
What you enter
- Area (m²)
- Sheet width (mm)
- Sheet length (mm)
- Waste (%)
What to watch out for
The result is a count of whole sheets with no cutting plan. If you need to know how to cut them, use the 2D sheet cutting calculator.
Formula
sheet area = (Sheet width ÷ 1000) × (Sheet length ÷ 1000)
with allowance = Area × (1 + Waste ÷ 100)
sheets = ⌈ with allowance ÷ sheet area ⌉The site's engine is a 1:1 port of the Android app's code.
Frequently asked questions
How many OSB sheets per m² of sheathing?
The calculator divides the area plus the waste allowance by the area of one sheet and rounds up to whole panels.
Does the result include a cutting plan?
No, it is the number of whole sheets with no cutting plan. To see how to cut them, use the 2D sheet cutting calculator.
Other calculators
Guides that use this calculator
The same formula in the app LiczMat for Android uses the same engine offline — with the material catalogue and results saved into a project. Download