Trim Paint Calculator
Estimate how much paint for trim using room perimeter, trim height, coats, and coverage. Include doors and windows to approximate casing footage and get gallons needed for interior trim projects.
Inputs
Tip: Increase waste for heavy profiles, priming, or multiple colors.
Results
Trim surface area
62.5 sq ft
137.5 sq ft adjusted for coats and waste
Gallons needed
0.39
Based on 350 sq ft per gallon.
Assumptions
- Perimeter represents baseboard length around the room.
- Adds about 17 ft of trim per door and 14 ft per window for casing.
- Trim height is used for baseboard and casing as a rough average.
Example
A 60 ft room with 5 in trim, 2 doors, 4 windows, and 2 coats needs about 0.39 gallons of trim paint at 350 sq ft per gallon.