Crown Molding Calculator
How much crown molding do you need? Enter your room size.
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Ceiling perimeter—
With 12% waste—
Estimated cost—
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How this calculator works
Crown molding runs the full perimeter of the ceiling. The calculator adds up all four walls and adds 12% for the angled miter cuts at every corner, which waste more than straight trim.
Worked example — a 14 ft × 12 ft room:
Perimeter 52 ft × 1.12 = 59 linear feet.
Corners eat material
Inside and outside corners on crown are cut at compound angles, so mistakes are common. The 12% cushion gives you room to redo a bad cut.
Frequently asked questions
How do I measure for crown molding?
Add up the length of all the walls in the room (the ceiling perimeter), then add about 12% for waste.
Why does crown waste more than baseboard?
The compound miter cuts at corners are harder to get right, so extra material saves a second trip.
Planning a wall or paint project
Surface condition matters as much as area. Rough, porous, repaired, or strongly colored surfaces may need extra primer or paint. Check the coverage printed on the product you plan to use and account for trim, ceilings, openings, and a second coat where applicable.
How to use this estimate
- Measure the project in the units shown and recheck your measurements before ordering.
- Use the waste allowance as a planning buffer, not as a substitute for a detailed material takeoff.
- Compare the result with the package yield, coverage, or weight listed by your supplier.
- Prices are user-entered estimates and may change by location, product, delivery, and season.
Accuracy and limitations
Calculapedia provides educational planning estimates. It does not inspect your site, select products, guarantee quantities, or replace a contractor, engineer, architect, building official, or supplier. Confirm the final quantity and any safety or code requirements before buying or building.