Crown Molding Calculator

Linear feet and pieces of crown molding for a room.

Crown molding

59 ft

Ceiling perimeter

52 ft12×14 room

Crown to buy

59 lin ftincludes 12% waste for compound miters

16-ft pieces

4 pieces

Cost (est.)

$146~$2.50/lin ft

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Crown molding adds an elegant, custom finish where wall meets ceiling — and it's the trim that humbles DIYers, because it's cut on two angles at once. Nail the corner cuts and the rest is easy; rooms are rarely square, so coping and caulk are your friends.

DifficultyAdvanced

TimeA day or two per room — corners take time to dial in

SkillsCompound miter cuts and coping; cut test pieces before your real stock

Tools you'll need

Compound miter saw
Coping saw
Crown stops or a jig for the saw
Brad nailer
Stud finder
Caulk and wood filler

Step by step

Mark the framingFind ceiling joists and wall studs/top plate so you have something solid to nail into.
Cut crown the right wayCut crown either nested (upside-down against the fence at its spring angle) or flat with compound bevel/miter settings. Cut scrap test pieces first — crown is easy to cut backwards.
Cope the inside cornersSquare-cut the first piece into the corner and cope the mating piece to its profile, so the joint stays tight on out-of-square walls.
Miter outside cornersCut and glue 45° outside miters (adjust for walls that aren't truly square).
Nail, fill, and caulkNail the top and bottom edges into framing, fill nail holes, and caulk the top and bottom gaps and any corner seams before paint.

Common mistakes

Cutting crown at the wrong orientation

Crown is cut at its spring angle, not flat (unless you set the compound bevel). Make test cuts and label your saw settings.

Mitering inside corners

Cope inside corners — they stay tight where 45° miters would gap.

Fighting out-of-square rooms

Expect gaps; close them with slight cut adjustments and a bead of caulk rather than chasing perfect joints.

Safety

Crown pieces are long and awkward — have a helper or stands.
Keep hands clear of the blade; use stops for repeatable, safe cuts.

Frequently asked questions

How much crown molding do I need?

Enter the room size above — the calculator adds 12% waste for compound miters and returns linear feet and 16 ft pieces.

Why is crown molding hard to cut?

It sits at an angle to both wall and ceiling, so corners are compound (two-angle) cuts. Nesting it against the saw fence at its spring angle makes it easier.

Cope or miter the corners?

Cope inside corners for tight joints; miter (and glue) outside corners.