Count plywood panels for wall and roof sheathing.
Dividing the sheathing area including waste by the area of one plywood panel, rounded up, gives the number of sheets to order. Plywood and OSB come in full panels, so rounding up to whole sheets keeps the order accurate for walls and roofs.
Plywood Sheets
Sheets = area x (1 + waste) / (sheet length x width)
Sheets = area x (1 + waste) / (sheet length x width) Dividing the sheathing area including waste by the area of one plywood panel, rounded up, gives the number of sheets to order.
Plywood and OSB come in full panels, so rounding up to whole sheets keeps the order accurate for walls and roofs.
This calculator takes 4 inputs: Area to cover, Sheet length, Sheet width, Waste allowance. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.