Door Casing Calculator
Estimate door-casing length, stock pieces, joints and material cost for identical rectangular door openings.
Default project preview
37 stock pieces
Base casing length
261.4 ft
Head pieces
16
Leg pieces
32
Opening perimeter
16.3 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Door opening width
Enter this project assumption in ft. The current imperial default is 3 ft.
Door opening height
Enter this project assumption in ft. The current imperial default is 6.67 ft.
Identical doors
Enter this project assumption in a unitless value. The current imperial default is 8. Minimum: 1.
Cased faces per door
Enter this project assumption in a unitless value. The current imperial default is 2. Minimum: 1. Maximum: 2.
Cut allowance
Enter this project assumption in %. The current imperial default is 12 %. Minimum: 0. Maximum: 40.
Stock trim length
Enter this project assumption in ft. The current imperial default is 8 ft.
Price per stock piece
Enter this project assumption in a unitless value. The current imperial default is 18. Minimum: 0.
How to read the outputs
Base casing length
before allowance. Default preview: 261.4 ft.
Head pieces
one per cased face. Default preview: 16.
Leg pieces
two per cased face. Default preview: 32.
Opening perimeter
three sides per face. Default preview: 16.3 ft.
Approximate miter joints
two head corners each. Default preview: 32.
Material cost
full stock pieces. Default preview: $666.00.
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 = (two opening heights + opening width) × doors × faces. Add the cut allowance, then divide by stock length and round up.
FAQ
Door Casing Calculator questions
Why count only three sides?+
Typical door casing covers the two jambs and head, not the threshold.
Should casing be measured at the opening edge?+
Measure along the intended reveal line because casing outside dimensions exceed the door opening.
Can eight-foot stock cover a standard door leg?+
Often, but tall openings and large reveals may require longer stock. Confirm the finished cut length.