How much paint do you actually need? Enter your room dimensions or total surface area, choose your paint type and number of coats — and get an exact litre figure.
Enter your room dimensions or area to calculate how much paint you need.
Buy the right amount, first time. Dulux and Crown trade ranges are available in exact litre quantities — no more guessing which tin size to buy.
View Paints on Amazon →Most UK emulsion paints cover 10–16 m² per litre. The spread rate varies by paint type: matt emulsions are thicker and cover less, while gloss paints are thinner and spread further. Surface texture also matters — rough plaster or bare masonry absorbs more paint and will need more product.
For a standard room, the paintable wall area = perimeter × height, minus windows and doors (approximately 1.5–2 m² each). We add 10% to the final figure as a sensible contingency for edges, touch-ups and any variability in your spread rate.