Crown Molding Calculator
Estimate crown molding linear feet for any room.
A crown molding calculator estimates the linear footage and number of sticks needed by calculating the room perimeter: 2 × (length + width). It then adds a waste allowance—typically 10% for straight rooms or 15% for rooms with many outside corners or coped joints—and accounts for stick length.
Perimeter
44
linear ft
With waste
48.4
10% added
8 ft sticks
7
sticks to buy
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Recommended tools & materials
Handy picks for this project on Amazon.
Brad Nailer
Invisible fastening for trim
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Coping Saw
Tight inside corners on molding
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Miter Saw
Accurate angle cuts
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Paintable Caulk
Hide gaps for a pro finish
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How does the crown molding calculator work?
Crown molding follows the room perimeter (2 × (L + W)). Add 10% waste for miter cuts, then divide by stick length (typically 8, 12, or 16 ft).
What else do people ask about this calculator?
How much crown molding for a 12×10 ft room?
Perimeter = 44 ft. With 10% waste = 49 ft. That's seven 8 ft sticks.
How much waste should I add?
10% is standard for straight rooms; 15% if you have many outside corners or coped joints.
Which related calculators should I use next?
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