How Much Paint for Ceilings, Trim and Doors
By the TapeMeasureCalc team · Updated · 6 min read
Most paint estimates cover the walls and stop there. Then the ceiling, the skirting boards, the door frames and the doors themselves turn into a second trip to the shop. They’re usually different products from the wall paint, so it makes sense to work them out separately. Here’s how, using the same 14 × 12 ft room as our wall paint guide.
The ceiling
A flat ceiling is just the floor area: 14 × 12 = 168 sq ft. Two coats is 336 sq ft. At 350 sq ft per gallon (check your can), that’s 0.96 gallons, so one gallon does it, with very little to spare.
In metric, a 4.2 × 3.6 m ceiling is 15.1 m², or 30.2 m² for two coats. At 10 m² per litre that’s about 3 litres. Two 2.5-litre tins give you a comfortable margin.
Sloped or vaulted ceilings have more area than the floor below them. Measure the sloped surfaces themselves, or the estimate will come up short.
Skirting boards and baseboards
Trim is measured by length, then turned into an area using its height.
- Room perimeter: 52 ft. Take off the 3 ft door opening: 49 ft of baseboard.
- A 4-inch (0.33 ft) baseboard: 49 × 0.33 = about 16 sq ft per coat.
Profiled trim has a little more surface than a flat board, but at this scale it hardly matters. Sixteen square feet is a small job; a quart (a quarter of a gallon) goes a long way.
Doors and frames
A standard 3 × 7 ft door has 21 sq ft per face. Painting both sides is 42 sq ft per coat, or 84 sq ft for two coats. Add the edges if you’re painting them, and allow more for panelled doors, which have more surface in the mouldings.
A door frame (casing) is trim again: roughly 17 ft of casing per side (two 7 ft legs and a 3 ft head), multiplied by its width. At 2½ inches wide that’s about 3.5 sq ft per side.
Adding it up
For this room, two coats of everything:
- Ceiling: 336 sq ft, ceiling paint, about 1 gallon
- Baseboard and both sides of the door casing: about 46 sq ft
- One door, both faces: 84 sq ft
- Trim and door together: about 130 sq ft, roughly 0.4 gallons at 350 sq ft per gallon
Trim and door enamels often state a different coverage from wall paint, so use the figure on your product. Here, two quarts or a single gallon of trim paint would cover it, and a gallon leaves plenty for touch-ups.
Tips
- Paint ceilings first, then walls, then trim and doors, so drips land on surfaces you haven’t finished.
- Glossy finishes show brush marks and drips more than flat ones; thin coats help.
- Bare wood, new plaster and stained surfaces may need primer, which is a separate product and a separate estimate.
Do it with the calculators
The paint calculator handles walls with doors and windows removed. For ceilings, use the floor area from the square footage calculator and divide by the coverage on the can. Our guide to how much paint you need for a room covers the walls. If you’re hanging new board first, the drywall calculator uses the same room measurements.