Ron Hazelton

How to Cut Plywood with a Circular Saw

Power Tools

Carpentry

Workshop Techniques

A Safe, Easy Method for Clean Cuts

Cutting a full sheet of plywood with a circular saw can be tricky as an 8-foot panel wants to bind, flex, or tip off your work surface. With the right setup, Ron shows us a proven method that keeps the wood stable and delivers clean, accurate cuts every time.

Why Cutting Plywood Is Tricky

A full 4×8 sheet of plywood is large and heavy. Without proper support, the wood can flex as you cut, causing kickback or movement that can be dangerous.

Ron shows us that supporting the panel properly is the trick to cutting plywood safely.

What You'll Need

2 sawhorses
2 pieces of scrap lumber (1×3s or 1×4s work well)
1 small scrap block of wood
Circular saw
Safety glasses
Tape measure and pencil

SEE FULL STEP-BY-STEP INSTRUCTIONS BELOW

Why This Method Works

Traditional setups support plywood only at the outer edges, leaving the cut zone unsupported. As the saw progresses, the two halves can sag inward and pinch the blade. This method eliminates that problem by adding a support point directly under the cut, so both halves remain level throughout. The result: no binding, no kickback risk, and a cleaner cut. Ron has many tips for using a circular saw including how to make accurate cross cuts.

Tips for Even Better Results

Use a straightedge guide. Clamp a long piece of straight lumber to the plywood as a fence for your saw's base plate to ride against. This virtually eliminates wavering and gives you factory-straight cuts.
Choose the right blade. A fine-tooth carbide blade (40–60 teeth) leaves a much cleaner edge on plywood than a coarse framing blade.
Cut with the good face down. Circular saws cut on the upstroke, so tearout happens on the top face. If your plywood has a finished side, place it face-down to keep it clean.
Mark your line carefully. Use a chalk line or a long straightedge and a sharp pencil for an accurate cut line before you ever pick up the saw.

Frequently Asked Questions

What blade should I use to cut plywood with a circular saw? A 40- to 60-tooth carbide-tipped blade designed for finish cuts works best. Avoid coarse framing blades, which leave ragged edges on plywood veneer.

How do I prevent tearout when cutting plywood? Cut with the finished face down (for circular saws), use a fine-tooth blade, and consider scoring your cut line with a utility knife before sawing to crisp up the edge.

Why does my circular saw keep binding when cutting plywood? Binding is almost always a support problem. If the plywood isn't supported on both sides of the cut, the two halves sag and pinch the blade. Follow the four-point support method above to eliminate binding.

How far apart should sawhorses be for cutting plywood? Set them about six feet apart for a standard 8-foot sheet. This provides stable support across the full length without the ends hanging free.

Step 1

Set Up Your Sawhorses

Space two sawhorses approximately six feet apart. This gives you a stable base that spans most of a standard sheet without letting either end hang unsupported.

Step 2

Lay Scrap Lumber Across the Sawhorses

Take two pieces of scrap 1×3 or 1×4 lumber and lay them flat across the sawhorses, perpendicular to the direction of your cut. You can tack these in place temporarily to keep them from shifting. These act as a raised platform so your circular saw's base plate can travel freely without the sawhorse legs getting in the way.

Step 3

Tack a Scrap Block at the Center of the Cut Line

Place a small scrap block of wood at the center of one sawhorse — right where your cut line will cross. Tack it lightly in place. This block serves as a sacrificial support directly under the cut, preventing the panel from sagging at its most vulnerable point.

Step 4

Position the Plywood

Lift the plywood onto your sawhorse setup and align your marked cut line directly over the center scrap block. The sheet should now be supported on both outer edges and on both sides of the cut — four-point support that eliminates flex.

Step 5

Set Your Blade Depth

Adjust your circular saw so the blade extends just ¼ inch below the bottom face of the plywood. This shallow setting means the blade will cut through the scrap block by only a quarter inch — deep enough to complete the cut cleanly, shallow enough to protect your sawhorses and keep the saw stable. What is also important is how to choose your saw circular saw blade.

Step 6

Put On Your Safety Glasses and Make the Cut

With your safety gear on, start your cut from one end and guide the saw smoothly along your cut line. Because the wood is supported on all sides of the cut, the panel stays stable, the kerf stays open, and the blade moves freely without binding.