Window Trim Calculator
Estimate window-casing length, full trim pieces, miter corners, apron length and material cost for identical rectangular windows.
Default project preview
15 stock pieces
Measured casing
108 ft
Purchased length
120 ft
Miter corners
24
Apron length
26 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.
Casing length = 2 × (width + height) × quantity × trimmed faces. Apply waste, divide by stock length and round up.
FAQ
Window Trim Calculator questions
Does the result include a window stool and apron?+
The main order uses full perimeter casing. Apron length is reported separately as a planning metric.
Can small offcuts be reused?+
Sometimes, but profile direction, grain, defects and minimum piece length affect reuse.
Should trim dimensions include reveals?+
Enter the outside trim dimensions that match the planned casing layout.