How to Make and Optimize a Plywood Cut List
Build a reliable plywood cut list from a drawing, group the stock, account for grain and kerf, and verify a worked one-sheet cabinet example.
A plywood cut list is the bridge between a drawing and a material plan. It needs to identify every finished rectangle without hiding joinery allowances, stock differences, face direction, or repeated quantities. Optimization comes after that information is trustworthy: a tight sheet layout cannot rescue a missing part or the wrong dimension.
Freeze the design assumptions first
Before transcribing dimensions, write down the drawing revision, intended outside dimensions, joinery method, and the material thickness the design assumes. A cabinet bottom captured between two sides is derived from the outside width and the actual side thickness. If either input changes, the bottom changes too.
Keep finished dimensions separate from rough-cut or milling dimensions. A sheet-layout optimizer should receive the rectangles you need after cutting, while edge trim and blade kerf remain stock settings. Adding an undocumented allowance to every part makes the list impossible to audit later.
- Name the drawing revision or dated sketch used to create the list.
- Record whether dimensions are finished, rough, or opening dimensions.
- Measure sheet thickness where it affects dados, rabbets, reveals, or inside widths.
Give every part a stable identity
Break the project into assemblies such as carcass, back, drawers, doors, and face frame. Assign a short ID before thinking about where the part might fit. An ID such as C-SIDE-L can carry the assembly, role, and handedness from the spreadsheet to a label on the physical panel.
Use one row for each unique combination of finished size, material, thickness, grain rule, and edge treatment. Quantity can represent truly identical parts. Mirrored panels, book-matched faces, or opposite edge-banding requirements deserve separate rows even when their rectangles are equal.
Write dimensions in one declared order—finished width × finished length × thickness—and keep that order throughout the project. Labels such as short side and long side are safer than relying on whichever orientation a rectangle happens to have on screen.
Split the list into real stock groups
An optimizer can only place parts together when they can come from the same stock. Separate groups by material, measured thickness, veneer or finish, grade, and any face-matching requirement. Three-quarter-inch maple plywood and a similar-looking 18 mm birch panel are different inputs even if both are described casually as cabinet plywood.
Solid-wood rails also belong outside a plywood sheet group because they are planned as linear stock. Keeping the groups explicit prevents an efficient geometric result from turning into an impossible purchase list.
| Stock group | Example parts | Reason it stays separate |
|---|---|---|
| 3/4 in maple plywood | Sides, bottom, shelves | Shared thickness and face veneer |
| 1/4 in birch plywood | Back panel | Different thickness and sheet |
| Solid maple | Face-frame rails and stiles | Linear-stock calculation |
Worked example: a 30-inch base cabinet carcass
This example assumes a 30-inch outside carcass width, two actual 3/4-inch sides, a 34 1/2-inch carcass height, and a 23 1/4-inch side depth. The bottom sits between the sides, so its between-side span is 30 − (2 × 3/4) = 28 1/2 inches. In the table, 22 1/2 inches is its front-to-back depth and 28 1/2 inches is the second layout axis. Two shelves receive 1/8 inch total side clearance and are 5/8 inch shallower than the bottom.
The list covers the plywood carcass only. It does not include a back, toe-kick details, face frame, doors, hardware, or edge banding. Those omissions are stated instead of being left for the reader to discover after material is purchased.
| Part | Input W | Input L | Qty | Rotation rule |
|---|---|---|---|---|
| Cabinet side | 23 1/4 in | 34 1/2 in | 2 | Grain locked with height |
| Bottom | 22 1/2 in | 28 1/2 in | 1 | Rotation allowed |
| Adjustable shelf | 21 7/8 in | 28 3/8 in | 2 | Rotation allowed |
| Top stretcher | 4 in | 28 1/2 in | 2 | Rotation allowed |
Check the area floor, then test the rectangles
Area gives a useful lower bound, not a cutting layout. The seven finished parts total 3,714.91 square inches. One 48 × 96 sheet contains 4,608 square inches, so the area-only lower bound is one sheet. That arithmetic still does not prove the rectangles fit after edge trim, kerf, and grain constraints.
With a 1/8-inch kerf, 1/4-inch trim on every edge, and the two side panels locked to the sheet direction, SawNest places all seven parts on one sheet. Finished-part yield is calculated against the full purchased sheet: 3,714.91 ÷ 4,608 = 80.6%. The remaining percentage includes blade paths, trimmed margins, and potentially reusable rectangular offcuts; it should not automatically be called trash.
Sides: 23.25 × 34.5 × 2 = 1,604.25 sq inBottom: 22.5 × 28.5 = 641.25 sq inShelves: 21.875 × 28.375 × 2 = 1,241.41 sq inStretchers: 4 × 28.5 × 2 = 228 sq inThe area result is reproduced from the listed dimensions. The separate placement check is what confirms the one-sheet fit.
Set rotation, kerf, and trim explicitly
Rotation is a rule for each part, not a project-wide guess. Lock parts whose visible face grain or construction requirement must follow a particular dimension. Allow rotation for utility parts only when turning them ninety degrees does not change the finished result.
Enter measured blade kerf once as a stock setting. Do the same for edge trim needed to remove damage or establish a reliable reference edge. If the sheet has unequal defects, reduce the entered stock to a conservative usable rectangle or plan that sheet separately; an equal trim field cannot describe an isolated void in the middle of a face.
- Do not inflate every part to simulate kerf.
- Do not rotate an exposed panel merely to improve the percentage.
- Do not mix stock groups simply because their nominal names sound similar.
Audit the optimized plan
Compare the input rows back to the drawing, total the quantity by assembly, and inspect every placed label. Then verify grain, face orientation, measured stock, and the value of the remaining rectangles. A one-sheet answer is useful only when every required part is placed and every stock assumption is still true.
The layout is a material-planning proposal, not a machine-operating sequence. SawNest cannot see material support, tool capacity, defects, guards, reference edges, or operator experience. Convert the layout into operations that follow the tool manufacturer's instructions and the conditions in the shop.