Crown Molding Calculator
Count crown molding lengths for a room perimeter, with a waste allowance.
Quick answer: enter your details below and click Count Pieces — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Measure the room perimeter in metres.
- Enter the length of one molding piece.
- Click Count Pieces.
About this tool
Enter the total perimeter and the length of one molding piece, and the tool adds a 10 percent allowance for mitre cuts and mistakes before rounding up to whole pieces. The allowance is shown separately.
Frequently asked questions
Should I buy one spare piece?
For rooms with many corners, yes. A spare piece is cheaper than a second trip.
Does ceiling height matter?
Not for the count, but taller profiles need more care at corners.