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How to Cut Crown Molding With a Miter Saw

Home/Resources/Power Tools & Workshop/Cut Crown Molding
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Written & researched by Priya Anand DIY & Tools Editor
Updated August 2026
Low-angle view of a person drilling into a timber board on a workbench, sawdust in the air, in warm late-afternoon light

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Crown molding intimidates people, but with a miter saw and the right method the corners are very doable — expect a learning curve, not a permit. A room’s worth of molding costs 50 to 200 dollars depending on profile and length, and the tools are a miter saw, a coping saw (optional), and a nail gun. The single biggest trip-up is orientation: crown is cut at an angle, and getting the up/down and left/right straight is 90 percent of the battle. The beginner-friendly approach is to nest the molding against the fence upside down and use one 45-degree miter setting; always test-fit on scrap first.

How To Cut Crown Molding Accurately (WOOD magazine)

Tools and materials

Golden-hour view of a person drilling into a timber board on a workbench, sawdust in the air

Step 1: Measure and check your corners

Measure each wall run, and use an angle finder to check each corner — real corners are seldom a true 90 degrees, and knowing the actual angle lets you fine-tune the miter. Note which corners are inside (concave) and which are outside (convex); they take opposite miter directions and mirror-image cuts.

Step 2: Nest the molding on the saw

Place the molding upside down and leaning against the fence at its spring angle — exactly how it sits on the wall, just inverted, with the ceiling edge on the saw table and the wall edge against the fence. A stop block or shim keeps that angle identical for every cut. Consistent spring angle is what makes corners close; a molding that leans differently on each cut produces gaps.

Wide environmental view of a person drilling into a timber board on a workbench, sawdust in the air, in warm late-afternoon light

Step 3: Set the miter and cut a test corner

Leave the bevel at zero and set the miter to 45 degrees (left or right for the corner and end you’re cutting). Cut two scrap pieces and dry-fit the corner before touching your real stock. Adjust the miter a degree or two if the joint gaps — this test-fit habit saves expensive molding.

Step 4: Cope inside corners for tight joints (optional)

For inside corners, pros often cope: leave the first piece square into the corner, then cut the second piece’s profile with a coping saw so it fits over the face of the first. Coped joints hide gaps far better than double miters as the house expands and contracts. Miter both pieces only if you’re confident in the wall angle.

Three-quarter view of a person drilling into a timber board on a workbench, sawdust in the air, in soft early-morning light

Step 5: Install, caulk, and fill

Nail the molding to the wall and ceiling framing (or to a backer) with finish nails, keeping the spring angle consistent along the run. Caulk the top and bottom edges to the wall and ceiling, fill nail holes and any corner gaps with wood filler, sand lightly, and paint. Caulk and filler forgive the small gaps that even careful cuts leave.

Where to go next

Angle cuts are a broad skill — build confidence with our speed square guide, and practice safe fastening with our nail gun safety guide. A picture frame is a good small-scale mitering project. It all lives under the power tools and workshop hub.

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Straight Answers

Frequently Asked

What is the easiest way to cut crown molding?

Cutting it 'nested' — held upside down and angled against the miter saw's fence the same way it will sit on the wall — is the most beginner-friendly method, because you only use the miter setting (usually 45 degrees) and leave the bevel at zero. The molding leans against the fence at its spring angle, so a simple left or right 45-degree miter gives the corner. The alternative, cutting it flat on the table, needs compound miter-and-bevel settings and is more accurate for wide molding but harder to visualize.

What angle do you cut crown molding for a 90-degree corner?

For a standard 90-degree wall corner using the nested method, set the miter to 45 degrees — left or right depending on the corner and which end of the piece you're cutting. If you cut the molding flat on the table (compound method) with the common 38-degree spring angle, the settings are about 31.6 degrees miter and 33.9 degrees bevel. Most walls aren't exactly 90 degrees, though, so always test-fit and fine-tune with a scrap before cutting your real piece.

What is the difference between an inside and outside corner?

An inside corner is the typical concave corner where two walls meet going into the room (most room corners); an outside corner is a convex corner that juts out, like around a chimney chase or a bumped-out wall. They use opposite miter directions and the mating pieces are cut as mirror images. On inside corners many pros 'cope' one piece — cut the profile with a coping saw to fit over the other — instead of mitering both, because coped joints hide gaps better as the house moves.

Why don't my crown molding corners close up?

Usually the molding wasn't held at a consistent spring angle, the wall isn't exactly 90 degrees, or you cut the wrong left/right miter. When nesting, the molding must sit against the fence at the same angle for every cut — a shim or a stop block keeps it consistent. Real corners are rarely a perfect 90, so gaps are normal; test-fit on scrap and adjust the miter a degree or two. For persistent inside-corner gaps, coping the joint closes them better than any miter.

Should I nest the molding or cut it flat?

Nest it (cut it upside down and against the fence) for narrow to medium crown and for simplicity — one setting, easy to remember. Cut it flat with compound miter-and-bevel settings for wide crown that won't fit nested against your saw's fence, or when you want maximum precision. Beginners should learn nested first because the mental model is simpler: the molding sits on the saw the way it sits on the wall, just inverted. Label a scrap block 'up is down' to keep the orientation straight.