Estimate crown, ceiling, or cornice molding from room dimensions, individual walls, exclusions, waste, stock lengths, corners, splices, and cost.
Measure the ceiling perimeter or selected wall runs, subtract only explicit architectural interruptions, and apply waste once.
Doors and windows are not automatically deducted because crown normally continues above them.
perimeter = 2 × (length + width)net length = gross length − explicit exclusionsplanning length = net length × (1 + waste rate)pieces = ceil(planning length ÷ stock length)minimum splices = max(0, ceil(wall length ÷ stock length) − 1)A 12 × 15 ft room has 54 ft perimeter. With 10% extra, 59.4 ft requires 5 pieces of 12 ft molding, providing 60 ft with about 0.6 ft surplus.
With 8 ft stock, the same room requires 8 pieces and provides 64 ft.
A 5 × 4 m room has an 18 m perimeter. With 10% extra, 19.8 m requires 9 pieces of 2.4 m stock.
Crown usually continues above doors and windows; enter only true ceiling-line interruptions.
Presets are editable conveniences and do not imply availability.
The estimate allocates fresh stock by wall and does not reuse offcuts.
No miter, bevel, cope, spring-angle, or optimized cut geometry is calculated.
Use exclusions for open-to-above areas, full-height cabinets, fireplaces, beams, or walls without crown.
Rectangular rooms contribute four inside corners each. Outside corners are user-entered because bump-outs and complex geometry cannot be inferred.
Corner blocks are optional. Default quantities match corner counts, with overrides available for project-specific needs.
Material cost uses whole pieces or purchased linear length. Optional corner-block cost is itemized and added separately.
Measure the ceiling-line runs, subtract explicit interruptions, add waste, and round stock pieces upward.
Usually no, because crown continues above them.
A basic rectangular room has four inside corners.
Use an allowance suited to cuts and complexity; 10% is editable, not universal.
Each wall is divided by stock length independently, without offcut reuse.
No. It is a stock-length estimate, not a cut list.
No. Spring angle is informational only.
No. Profile dimensions do not affect linear quantity.