The No-Nonsense Plywood Buying Guide: Grades, Types, and What to Actually Use

Standing in front of the plywood section at a lumberyard for the first time can be baffling. There are grades like A, B, C, and D. Core types like veneer core, MDF core, and particleboard core. Thicknesses that are never quite what they say on the label. And prices that range from $25 to $120 per sheet for what looks like essentially the same thing.

Let me decode this so you can walk in and buy what you need with confidence.

Understanding Grades

Plywood grades describe the quality of the face veneers. Each sheet has two faces, and they are graded separately. An A-B sheet has one A-grade (smooth, sanded, minimal defects) face and one B-grade (solid but with some patches or minor blemishes) face.

For furniture and visible projects, you want A-grade on the show face at minimum. For shop jigs, drawer boxes, and hidden components, B or C grade saves you money without any functional compromise.

Core Types Matter

Veneer Core

Traditional plywood, thin wood veneers stacked with alternating grain direction. This is the strongest option for its weight and holds screws well on the edges. It is the go-to for cabinet carcasses and anything structural. The downside is that the edge can show voids between layers, which looks rough if left exposed.

MDF Core

A smooth medium-density fiberboard core with hardwood veneer faces. MDF core is heavier than veneer core but gives you a perfectly flat, smooth panel. It is excellent for surfaces that need to be dead flat, tabletops, wide doors, and panels that will be painted. Edge-screw holding is poor compared to veneer core.

Combination Core

A hybrid, MDF crossbands immediately under the face veneer, with veneer core in the middle. You get the flat, smooth surface of MDF core with better screw holding and lighter weight. This is the premium option and the price reflects it.

What to Buy for Common Projects

Thickness Is a Lie

Plywood sold as 3/4 inch is almost never actually 3/4 inch. Domestic plywood typically measures 23/32 inch. This matters when you are cutting dados for shelves or making drawer slides, always measure the actual sheet before cutting your joinery to fit. Baltic Birch is one of the few exceptions that is consistently close to its stated thickness.

When estimating how much plywood you need, plan your cuts on a cut diagram before buying. Plywood waste adds up fast, and a few minutes of planning can save you an entire sheet. Our Board Feet Calculator helps with solid wood, but for plywood, sketch your parts on a rectangle matching the sheet size.