Trim Paint Calculator
Trim paint is sold in small containers because you rarely need a lot. Enter your room dimensions and which components you're painting. We'll size the order exactly.
Advanced options
- Baseboard linear ft
- 0
- Baseboard paint area
- 0 sq ft
- Door casings area
- 0 sq ft
- Window casings area
- 0 sq ft
- Door faces area
- 0 sq ft
- Total paintable
- 0 sq ft
- Gallon equivalent
- 0
- Estimated cost
- —
How the trim calculator works
Trim paint covers more surface area per container than wall paint because you're painting narrow strips, not broad walls — but the layout is fiddly. This calculator breaks the room into the four surfaces that typically get trim paint, adds them up, and rounds to whole containers.
Baseboards: total perimeter of the room 2 × (length + width) times the baseboard's face width. Multiply by coats.
Door casings: approximately 17 linear ft (~5.2 m) per door (two sides at 6'8" + top at 3' + margin). At a typical casing profile, that's a few square feet per door per coat.
Window casings: approximately 14 linear ft (~4.3 m) per standard window.
Door faces: a standard door is ~20 sq ft (~1.85 m²) per side — both sides at 2 coats means ~80 sq ft / 7.4 m² per door painted area. This is the biggest contributor if included.
When to uncheck components
- Skip door faces if your doors are hollow-core factory-finished or stained wood you're leaving as-is. Cuts paint needs by more than half.
- Skip window casings if your windows are newer vinyl units with integrated trim that doesn't get painted.
- Skip baseboards only if you've already painted them recently and just want a touch-up — in which case a sample-size pint is enough.
Why semi-gloss for trim
Every component here gets touched, bumped, cleaned, or scuffed more than walls. Semi-gloss paint is denser than flat/eggshell paint, which means it resists scuff marks, wipes clean without "flashing", and gives crisper lines at the inside corners.
For the walls, ceiling, and overall room paint estimate, head to the paint calculator.