To work out how much paint you need for a ceiling, calculate your room’s floor area and use a coverage rate of 12 square metres per litre for one coat. For a standard double bedroom with a 10.5 square metre ceiling, you will need 0.9 litres for one coat or 1.8 litres for two coats. The exact amount depends on your specific room dimensions, which can be found in the table of common UK room sizes.
Ceiling paint coverage follows a simple rule: most ceilings require 12 m² per litre for a single coat. The amount you need depends entirely on your room’s floor dimensions-a 3 × 3.5 metre bedroom uses roughly half what a 4.2 × 5.5 metre living room does. Two coats simply double the quantity. Rather than guess, measure your ceiling length and width, then cross-reference the table. Most rooms fit one of the six standard sizes listed; if yours doesn’t, the paint calculator lets you enter exact measurements for a precise figure.
| Ceiling | Area | Paint needed | Tin to buy |
|---|---|---|---|
| Single bedroom (2.7 x 3 m) | 8.1 m2 | 0.7 litres for 1 coat, 1.3 for 2 | 2 x 1 L |
| Double bedroom (3 x 3.5 m) | 10.5 m2 | 0.9 litres for 1 coat, 1.8 for 2 | 2 x 1 L |
| Large double (3.5 x 4.2 m) | 14.7 m2 | 1.2 litres for 1 coat, 2.4 for 2 | 2.5 L |
| Small living room (3 x 3.5 m) | 10.5 m2 | 0.9 litres for 1 coat, 1.8 for 2 | 2 x 1 L |
| Average living room (3.5 x 4.5 m) | 15.8 m2 | 1.3 litres for 1 coat, 2.6 for 2 | 2.5 L + 1 L |
| Large living room (4.2 x 5.5 m) | 23.1 m2 | 1.9 litres for 1 coat, 3.9 for 2 | 2.5 L + 2 x 1 L |
How the number is worked out
Wall area is the perimeter times the 2.4 m ceiling, minus one door and the windows. Matt emulsion covers about 12 m2 per litre for one coat, so two coats over that area gives the litres in the table. Buy the next tin size up: paint left over is cheaper than a second trip and a slightly different batch.
Ceilings are counted separately, because the area is the floor area rather than the perimeter, and most people use a different paint for them. Skirting, architrave and doors are separate again: they take eggshell or gloss, which covers further per litre but needs an undercoat if the wood is bare.
What changes the number
Bare plaster drinks the first coat, so add a mist coat of watered-down emulsion before you start counting. A dark colour going over a pale one usually needs three coats rather than two, and a strong red or deep blue can need four. Textured or heavily filled walls swallow noticeably more than smooth plaster. Rollers with a long pile hold more paint and spread it thicker, which is why two people painting the same room from the same tin can end up with different amounts left over.
Work out your own
The table covers the usual cases. For your exact measurements, the paint calculator does the same arithmetic in the browser and gives you a size to shop for.
Related guides
- How Much Paint For a Bedroom? (UK Sizes and Litres)
- How Much Paint For a Living Room? (UK Sizes and Litres)
- How Much Paint For One Wall? (Feature Wall Litres)
What if your ceiling is higher or sloped?
Ceiling height alone does not change how much paint you need. A 4-metre-high room with a 3 × 3.5 metre ceiling uses the same amount as a standard 2.4-metre room, because coverage is based on the horizontal surface area only. However, if your ceiling is vaulted or sloped, you must measure the actual painted surface area rather than just the floor footprint. A vaulted 3 × 5 metre room has significantly more surface area than a flat one at the same dimensions, so measure along the slope or use a paint calculator to account for the extra angle.
Common questions
What if my ceiling is higher than 2.4 metres?
The coverage rate (12 m² per litre) is based on horizontal area alone, not ceiling height. A 4-metre-high room with a 3 × 3.5 m ceiling still needs the same paint quantity-height doesn’t change how much you apply to the surface.
Should I buy slightly more paint than the table suggests?
Yes. Buy the next tin size up. Ceilings are unforgiving; you’ll need extra for touch-ups, and tins from different batches may vary slightly in colour. If the table shows 1.3 litres, buy a 2.5 L tin rather than two 1 L tins.
Does primer count toward my paint quantity?
No. Primer and topcoat are separate. If your ceiling is stained, water-damaged, or a dark colour, primer uses roughly 12 m² per litre as well. Add primer litres to paint litres for the total you’ll need.
What if I’m painting a vaulted or sloped ceiling?
Measure the actual surface area, not the floor footprint. A vaulted 3 × 5 metre room will have more surface area than a flat 3 × 5 metre room. Measure along the slope or use the calculator to account for the extra angle.
Frequently asked questions
Does ceiling height affect how much paint I need?
No, it does not. The amount of paint needed is based on the horizontal surface area of the ceiling alone. A room with a 4-metre-high ceiling but the same floor dimensions as a standard room will require the same quantity of paint.
Should I buy more paint than the table suggests?
Yes, you should buy the next available tin size up. This allows for touch-ups and ensures colour consistency, as tins from different batches can vary slightly. If the table shows 1.3 litres, buy a 2.5 litre tin.
What if I have a vaulted or sloped ceiling?
You must measure the actual painted surface area, not just the floor footprint, as a sloped ceiling has a larger surface. Measure along the slope or use the provided paint calculator to get an accurate figure for the extra area.
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