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Crown Molding Calculator

Estimate the linear feet of crown molding needed and how many stock sticks to buy.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
13.12 ft11.48 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Crown molding needed

56.59 linear ft

High confidence
Ceiling perimeter
49.21 linear ft
Sticks needed
8 x 8 ft sticks

Running these inputs gives 56.6 linear ft as the crown molding needed. Ceiling perimeter carries the most weight in this calculation, at 49.2 linear ft. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Room perimeter = 2 x (length + width); crown molding runs the full ceiling perimeter since doorways don't reach the ceiling
  • 15% waste is standard for crown molding to account for compound-angle corner miters, higher than flat trim's typical 10%

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why doesn't this subtract doorways like baseboard does?
Crown molding runs where the wall meets the ceiling, well above any doorway or window opening, so it runs the full uninterrupted perimeter of the room.
Why is the waste factor higher than flat baseboard trim?
Crown molding corners require a compound miter (angled in two planes at once) instead of a simple 45° flat cut, which is harder to get right and wastes more material on practice cuts and corrections.
Do inside and outside corners waste different amounts?
Outside corners are generally trickier to cut cleanly than inside corners — rooms with several outside corners (like an L-shaped room) may want to budget slightly above the standard 15%.