Crown Molding Calculator — Free Online Crown Molding Calculator
Calculate linear feet and pieces of crown molding or trim. 100% free, no signup.
Pieces to buy
0
Perimeter0 ft
With waste0 ft
Piece length0 ft
How much crown molding or trim do I need?
Measure the perimeter of the room (add up all wall lengths, or use 2 × (width + length) for a rectangle), add about 10% for miter cuts and mistakes, then divide by the length of the molding pieces you're buying and round up.
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Frequently asked questions
Does this work for baseboard and trim too?
Yes — the math is identical for crown molding, baseboards and chair rail. For baseboards, subtract your door widths from the perimeter.
Why add 10% waste?
Corners need 45° miter cuts and the occasional piece is mismeasured, so a 10% buffer (more for many corners) avoids extra trips to the store.
Redesigning the whole room?
Download RoomGPT free and see your space in 100+ styles from a single photo.