Door and Window Trim Calculator
Estimate casing length, full stock pieces, purchased length and installed cost for repeated doors and windows using editable opening sizes and stock lengths.
Default project preview
16 stock pieces
Installed trim length
229 ft
Door casing length
85 ft
Window casing length
144 ft
Purchased length
256 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Door casing = 2 × height + width. Window casing = 2 × (height + width). Total length applies the cut allowance before stock pieces are rounded up.
FAQ
Door and Window Trim Calculator questions
Why are doors calculated on three sides?+
Typical interior door casing covers both jamb legs and the head, without casing across the floor.
Does this include both faces of each opening?+
No. The defaults calculate one trimmed face. Double the opening counts when both sides receive the same casing.
Are window stools and aprons included?+
No. Add their measured lengths separately or increase the allowance.