Crown molding is priced by the linear foot but installed by the stick, and every corner requires a compound mitre cut that consumes material. This calculator gives you the room perimeter, the number of sticks to buy, and an installed cost estimate that reflects the real waste factor.
Also running baseboard? See Linear Feet for Baseboard.
About pricing on this page
This calculator is intentionally price-light. Absolute dollar figures are deliberately omitted because they vary too widely by region, brand, and installer to be useful as planning estimates. The relative-comparison tables below show how options stack up against each other — which is the durable, actionable information. For a real budget, get two or three written quotes from local suppliers and contractors after they have seen the job.
Crown Molding Calculator
Enter room dimensions and molding stock length. Results include waste for mitre cuts.
The Crown Molding Formula
Perimeter = (Length + Width) × 2
Order = Perimeter × (1 + Waste %)
Sticks = Order ÷ Stock Length, rounded up
Crown molding gets a higher waste factor than flat trim because every corner is a compound mitre — the blade is angled in two planes at once, and getting it wrong ruins the whole end of the stick. Fifteen percent is a sensible floor for a first-time installer, and even experienced carpenters plan on 10%.
Worked example: A 14 × 12 ft living room. Perimeter is (14 + 12) × 2 = 52 linear feet. Add 15% for mitre waste: 59.8 LF. In 12 ft sticks: 59.8 ÷ 12 = 4.98 → 5 sticks (60 LF). At $4.50 per foot that is $270 in material, plus $312 labor at $6/LF for $582 installed.
Crown Molding Needed by Room Size
Perimeter with a 15% waste allowance, and stick counts for common stock lengths.
| Room Size | Perimeter (LF) | Order +15% | 8 ft Sticks | 12 ft Sticks | 16 ft Sticks |
|---|---|---|---|---|---|
| 8 × 10 ft | 36 | 41.4 | 6 | 4 | 3 |
| 10 × 12 ft | 44 | 50.6 | 7 | 5 | 4 |
| 12 × 12 ft | 48 | 55.2 | 7 | 5 | 4 |
| 12 × 14 ft | 52 | 59.8 | 8 | 5 | 4 |
| 14 × 16 ft | 60 | 69.0 | 9 | 6 | 5 |
| 16 × 20 ft | 72 | 82.8 | 11 | 7 | 6 |
| 20 × 24 ft | 88 | 101.2 | 13 | 9 | 7 |
Longer sticks mean fewer scarf joints along a wall, which matters visually because a poorly cut scarf joint opens up as the wood moves seasonally. Use the longest stock that will fit through your doorways and up your stairs.
Crown Molding Cost by Material
| Material | Cost per LF | Install Labor per LF | Best For |
|---|---|---|---|
| MDF (primed) | Budget material | Reference only | Paint-grade, budget, most rooms |
| Finger-joint pine | Reference only | Reference only | Paint-grade, better durability |
| Solid pine | Reference only | Reference only | Stain or paint, standard profiles |
| Poplar | Premium material | Reference only | Paint-grade premium, stable |
| Oak | Reference only | Reference only | Stain-grade, traditional |
| Polyurethane / foam | Reference only | Reference only | Ornate profiles, bathrooms |
| Plaster | Reference only | Reference only | Historic restoration, luxury |
MDF is the default choice for painted crown because it is dimensionally stable, has no grain to telegraph through paint, and costs a fraction of hardwood. Its weakness is moisture, so avoid it in bathrooms and unconditioned spaces.
Common Crown Molding Mistakes
Using a 10% Waste Factor on Your First Install
Compound mitre cuts are the hardest part of trim work, and the first few corners of a first project usually end up as scrap. Budget 20% if you have not cut crown before, and buy one extra stick beyond that to practice on. Running out mid-project means a second trip and possibly a different lot with slightly different profile dimensions.
Mitring Inside Corners Instead of Coping
Mitred inside corners open into a visible gap as soon as the house moves seasonally, which it always does. Coping — cutting one piece to the profile of the other — absorbs that movement and stays tight. Coping takes longer and requires a coping saw or a jigsaw, but it is what separates work that still looks right in five years from work that does not.
Ignoring Out-of-Square Corners
Almost no residential corner is exactly 90 degrees. Cutting every mitre at 45 degrees on the assumption that it is produces gaps that no amount of caulk hides well. Check each corner with an angle finder and split the actual measured angle. On a room where corners run 88 to 92 degrees, measuring each one is the difference between tight joints and gaps you cannot caulk away.
Forgetting That Crown Sits on Two Planes
Crown molding spans the wall and ceiling at an angle, so its effective coverage is not the same as its face width. This matters when you are matching a profile to a room's proportions — a 5-inch crown in a room with 8-foot ceilings visually lowers the ceiling. As a rule, keep crown height at roughly half an inch per foot of ceiling height.
About these price ranges
Pricing varies widely by region, season, project size, and site conditions. Treat every figure on this page as a planning estimate for budgeting only — not as a quote. Coastal metro markets commonly run 20–40% above national ranges while rural inland markets can fall 10–20% below. Always collect at least three written quotes from local contractors before committing to a budget.
Unsourced estimates: All dollar figures on this page. The relative-comparison tables above are sourced from general trade conventions and the labour-plus-material methodology used in industry references, not from a specific published price index. These are informed planning figures rather than data drawn from a published price index, and they carry a correspondingly wider margin of error.