FIELD NOTE / CUTLISTSHEET
Plywood Sizes: Sheet Dimensions and Actual Thickness
A buying chart for 4×8, 4×10 and 5×5 sheets, with the dimension details that change a real cut list.
Nominal sheet sizes are a starting point
A sheet sold as 4 × 8 ft is normally 48 × 96 in, or 1,219.2 × 2,438.4 mm. That is the stock size you should enter into a cut list optimizer, but it is not always the clean cutting area. A rough edge, a damaged corner, a panel saw trim allowance or a supplier's actual metric conversion can reduce the usable rectangle. Enter trim as a per-edge allowance: 1/4 in trim leaves 47 1/2 × 95 1/2 in before kerf is considered. The sheet-size field and the trim field therefore answer different questions.
5 × 5 Baltic birch is commonly 60 × 60 in, or 1,524 × 1,524 mm. It is square, compact and often useful for drawer parts, speaker boxes and small furniture. A 4 × 10 panel is 48 × 120 in, which can reduce seams on long cabinet sides but may cost more and be harder to transport. Metric 2440 × 1220 mm is close to 96.06 × 48.03 in, not an exact imperial 4 × 8; if a supplier prints metric dimensions, enter those numbers rather than rounding them to 96 and 48.
Panel labels use a performance category and a declared thickness, which can differ from a round nominal size. Consult the APA plywood guidance and the actual supplier specification; the chart below is a planning range, not a universal tolerance.
Thickness, veneer and the part that actually fits
| Nominal | Common actual range | Inches to mm | Typical use |
|---|---|---|---|
| 1/4 in | about 5.5–6.35 mm | 6.35 mm nominal | backs, drawer bottoms |
| 1/2 in | about 12–12.7 mm | 12.7 mm nominal | boxes and light panels |
| 3/4 in | about 18–19.05 mm | 19.05 mm nominal | cabinet cases and shelves |
| 1 in | about 23–25.4 mm | 25.4 mm nominal | heavy work surfaces |
The table is a planning convention, not a substitute for a caliper. A shelf sized for a 3/4 in case may need a different groove or reveal when the panel measures 18 mm. The cabinet calculator uses the value you provide and labels the generated material so the thickness decision remains visible. Keep sheet thickness separate from length and width: thickness changes joinery and hardware, while the 2D optimizer uses the face dimensions for nesting.
Grain direction matters on veneered plywood and on some decorative laminates. The optimizer's grain lock keeps the part's long dimension along the stock length, so a 30 × 50 in part cannot be rotated onto a 48 in-wide sheet just to make the math fit. If a panel is truly rotation-safe, leave the box unchecked and the engine can use the alternate orientation. This is a production choice, not a visual preference.
How many parts fit?
96 × 48 in: 6 sides fit
60 × 60 in: 2 sides fit
Area gives a quick lower bound, never a finished layout. Three sheets of 4 × 8 provide 13,824 in². A 38-piece kitchen cabinet cut list with 11,450.9 in² of parts has an area yield of 82.8% before unusable slivers, kerf and grain locks. The actual placement can still require four sheets if the long sides and narrow shelves fragment the available rectangles. The live diagram is the authoritative check for that project.
When two stock sizes have prices, add both rows with the same material name. CutlistSheet independently packs each option with unlimited stock, reports sheet count, cost and utilization, then marks the cheapest complete option. A 4 × 8 at $68 may beat a 5 × 5 at $96 even when the square sheet has a convenient shape; the decision should include the count, the price and the parts that fit without rotation. Start with the plywood cut calculator to test that case, then return to the free cutlist optimizer for the final project.
Transport, trim and a buying checklist
Sheet dimensions also affect the path from the lumberyard to the saw. A 4 × 10 panel can be efficient for a 78 in wardrobe side, but a small shop may only have a 48 in rack or a vehicle that safely carries 8 ft material. A 5 × 5 panel can be easier to handle and can reduce the offcut shape for drawer fronts, yet it may require five sheets where 4 × 8 requires three. Treat handling as a real constraint: record the maximum panel you can move, the supplier's quoted size, and whether the panel must be squared before the first layout.
Before buying, verify five numbers: face length and width, nominal thickness, actual thickness if joinery depends on it, price per sheet, and the number of usable edges. Then enter a kerf such as 1/8 in and a trim allowance such as 1/4 in per edge. A diagram that reports 63.2% utilization still needs the disclaimer's practical allowance; plywood has voids, chipped edges and grain direction that a pure area ratio cannot see. The final cut order should start with a safe reference edge, keep the marked face oriented consistently, and leave any keepable offcut labeled with its measured dimensions.
Use the table saw kerf guide when changing blades, and keep metric and imperial rows separate when a shop receives both 2440 × 1220 mm and 96 × 48 in stock. The conversion 1 in = 25.4 mm is exact, but a supplier's panel tolerance is not. The cutlist optimizer stores the project in millimeters internally and only formats the visible values, so switching between in, mm and cm does not silently throw away the entered precision.