Trim Molding Calculator

Inputs

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Choose perimeter trim or opening casing. Casing mode estimates two side legs plus one head piece per opening.
Length of one typical room or repeated space.
ft
Width of one typical room or repeated space.
ft
Number of identical rooms using the entered length and width.
rooms
For baseboard and chair rail, this is the total doorway/opening count deducted from the perimeter. For casing, it is the total openings being trimmed.
openings
Average width per opening. Baseboard/chair rail subtracts this width; casing adds it as the head piece.
ft
Purchased length of one trim stick or molding board.
ft
Extra length for miters, scarf joints, defects, measuring mistakes and attic stock.
%
Optional material price for one purchased trim stick.
$/piece

Results

Default result
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Stock pieces to buy
4pieces

Rounded up to whole stock lengths after waste.

Also computed

Trim length with waste41.8ft

Net trim length38ft

Purchased length48ft

Leftover after waste6.2ft

Material cost56$

Room perimeter used44ft

Method notes 3 notes
  • Baseboard and chair rail modes subtract average opening width from the room perimeter.
  • Stock pieces = ceil(net trim length x (1 + waste/100) / stock length).
  • This is a material takeoff. It does not optimize individual cuts, account for every miter/scarf location, or specify fasteners, adhesive, profile selection, code requirements or field fit.

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