Paint Calculator (Litres Needed)
Enter the room size, doors, windows and coats to see how many litres of paint to buy.
How much paint do I need for a room?
Multiply the room perimeter by the wall height, subtract doors and windows, then multiply by the number of coats and divide by the tin coverage. Most emulsions cover about 12 m² per litre; textured walls and bare plaster soak up more.
Painting a ceiling too? The ceiling area is shown separately. Measuring other materials? Try the Tile Calculator.
Frequently asked questions
How many litres of paint for a 4×3 m room?
With 2.4 m walls, two coats and a door and window, you need roughly 5 litres of emulsion for the walls.
How many coats of paint do I need?
Two coats is standard. Going from dark to light, or painting new plaster, may need a mist coat plus two.
Should I buy extra paint?
Round up and keep a little for touch-ups; mixing batches later can give slight colour differences.
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