Plywood Sheet Calculator
Find how many identical parts fit on a sheet of plywood or MDF, and how many sheets to buy.
How to use this plywood calculator
Enter the finished size of one part in inches and how many you need, such as shelves, cabinet sides or box panels. Choose the sheet size you're buying and your saw blade's kerf (the width of wood the blade turns to sawdust, usually ⅛ inch). If the wood grain should run along the length of each part, say they can't turn sideways.
The calculator lays the parts out in neat rows and columns, the way you'd cut them on a table saw or with a track saw, and tells you how many fit on one sheet.
The math behind it
- Parts across = (sheet width + kerf) ÷ (part width + kerf), rounded down.
- Parts along = (sheet length + kerf) ÷ (part length + kerf), rounded down.
- Parts per sheet = across × along. If turning is allowed, it also tries the parts sideways and uses whichever fits more.
- Sheets = parts needed ÷ parts per sheet, rounded up.
Example: ten shelves 11¼ × 36 inches with a ⅛-inch kerf fit 8 to a 4 × 8 sheet (4 across, 2 along), so you need 2 sheets.
Often used together
Quick answers
How many 12-inch shelves can I get from a sheet of plywood?
A 4 × 8 sheet rips into three 12-inch strips plus a narrow leftover, after allowing for the saw blade. Each 8-foot strip can then be cut into shelves of whatever length you need.
Does this work for mixed part sizes?
It's built for identical parts. For a mix, run each size separately and add up the sheets. Your real total may be a bit lower if you fit small parts into the leftover pieces.
What's the actual size of a sheet of plywood?
Usually a full 48 × 96 inches. Some cabinet-grade sheets are slightly oversized, and Baltic birch often comes in 5 × 5 ft (60 × 60 inch) sheets.