Crown Molding Calculator

💡 How to Calculate Crown Molding

Crown molding is measured by room perimeter. Measure each wall separately to account for closets, alcoves, and bump-outs. Standard piece lengths are 8, 12, or 16 feet. Add 10% for waste — crown molding cuts at compound angles waste material at each joint.

Inside corners require coped joints (preferred) or compound miter cuts. Outside corners use miter joints. Count corners to plan your cuts. For a typical rectangular room, you have 4 inside corners and 0 outside corners.