Trim and Molding Calculator
Find how much baseboard and door and window casing a room needs, in linear feet and stock pieces.
Change the values and press Calculate to work out your own figures.
Enter the room's size, the doors and windows and the casing width.
Show the working
- base = perimeter − 32 in a doorway
- casing for 32 × 80 in doors (3 sides) and 32 × 54 in windows (4 sides)
How to use it
Enter the room's size, the doors and windows and the casing width.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
base = perimeter − doorways door casing = (width + 2 × casing) + 2 × (height + casing) window casing = 2 × (width + 2 × casing) + 2 × (height + 2 × casing)
Buying
Buy pieces long enough for each wall in one length where you can, and allow for 45° miters at corners.
Questions
How much trim for a 12 × 10 ft room?
About 89.75 ft: baseboard, one door and two windows cased.
Formulas
base = perimeter − doorways door casing = (width + 2 × casing) + 2 × (height + casing) window casing = 2 × (width + 2 × casing) + 2 × (height + 2 × casing)
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.