Plywood and Sheet Goods Sizes: A Practical Reference

Before you can optimize a cut list, you need to know what stock sizes are actually available to buy — and that varies more than most people expect, especially once you compare North American, European, and Australian suppliers.

The default: 4×8 ft (1220 × 2440mm)

The vast majority of plywood, MDF, OSB, and particleboard sold in North America comes in 4 × 8 foot sheets, which is 1219 × 2438mm in metric (commonly rounded to 1220 × 2440mm). This size is standard enough that most cutlist tools — including ours — use it as the default preset.

Common thicknesses for 4×8 sheets:

• Plywood: 1/4“, 1/2“, 3/4“ (6mm, 12mm, 18mm nominal)
• MDF: 1/2“, 3/4“, 1“ (12mm, 18mm, 25mm)
• OSB: 7/16“, 5/8“, 3/4“

Half sheets and quarter sheets

Many suppliers pre-cut 4×8 sheets into 4×4 ft (1220 × 1220mm) half sheets or smaller, usually at a per-sheet premium. If your parts are small enough to fit efficiently on a half sheet, buying half sheets can reduce waste and make material easier to transport — but the per-square-foot cost is almost always higher. Run both scenarios through a cut optimizer before deciding; sometimes the “wasteful-looking” full sheet is still cheaper once you account for the half-sheet premium.

Metric / continental sizes

Outside North America, particularly in continental Europe, melamine-faced particleboard and MDF are frequently sold in larger sheets:

• 2440 × 1220mm — matches the imperial 4×8 equivalent
• 2750 × 1830mm — a larger continental standard, common for melamine and particleboard
• 3050 × 1220mm — an extended-length option some suppliers carry for long panels without a seam

Larger sheets can dramatically reduce waste for long parts (think wardrobe sides or long shelving), but they’re heavier, harder to handle solo, and not every supplier stocks them — confirm availability before designing a project around a less common size.

How stock size choice affects waste

This is the part most people skip: the “best” stock size depends entirely on your specific part list, not on some universal rule. A few examples:

• A run of small drawer parts might nest almost perfectly on standard 4×8 sheets with under 5% waste.
• The same shop cutting long bookcase sides (say, 1900mm tall) might waste 15–20% of every 2440mm sheet because the extra ~540mm per sheet can’t fit another full-height part.
• Switching that second project to a 2750 × 1830mm continental sheet, laid the other direction, could drop waste back under 8%.

You can’t reliably eyeball this. It’s exactly the kind of arithmetic a packing algorithm is good at and humans are bad at.

Using presets in the optimizer

The cutlist optimizer ships with one-click presets for the sizes above — plywood/MDF 4×8, half sheets, and both common melamine/particleboard sizes — so you’re not stuck typing 2440 and 1220 from memory. Add a preset, adjust the cost per sheet to match your supplier’s pricing, and the tool will tell you exactly how many sheets you need and what your waste percentage looks like.

If your supplier carries a size that isn’t in the preset list, you can enter any custom width and height directly — there’s no restriction to “supported” sizes.

Related reading: Kerf width explained and reducing plywood waste.