Window Trim Calculator

Calculate window trim (casing) needed for all windows. Enter window sizes and quantity for total linear feet.

πŸͺŸ Window Trim Calculator

Results

Trim per Window14.0 lin ft
Total Trim112.00 lin ft
With 10% Waste123.20 lin ft
8 ft Pieces16 pieces

πŸ’‘ How to Calculate Window Trim

Window trim perimeter = 2 Γ— (width + height) for each window. Multiply by the number of windows for total linear feet. Add 10% for waste from miter cuts at corners. Standard window casing is 2.25 to 3.5 inches wide.

For picture-frame style casing (trim on all 4 sides), calculate the full perimeter. For traditional casing with a sill/stool, calculate 3 sides (top and both sides) plus the sill and apron separately.

Eight windows at 36Γ—48 inches: perimeter each = 14 ft. Total = 112 ft + 10% = 123 ft. That is 16 pieces of 8 ft trim.

Window Trim Calculator FAQ

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