2.4m ceilings, one door and one window, two coats at about 12m² per litre, 10% extra.
Room
Wall area
Walls (2 coats)
Ceiling (2 coats)
3 × 3 m
25.4 m²
4.7 L
1.6 L
4 × 3 m
30.2 m²
5.5 L
2.2 L
4 × 4 m
35.0 m²
6.4 L
2.9 L
5 × 4 m
39.8 m²
7.3 L
3.7 L
The sum
Wall area = 2 × (length + width) × height − 1.9m² per door − 1.5m² per window
Litres = wall area × coats ÷ 12 × 1.1
The paint calculator works out the cheapest mix of 5L and 2.5L tins for your room and paint type.
Frequently asked questions
How many m² does a litre of paint cover?
Standard emulsion covers about 12m² per litre per coat on smooth walls. One-coat paints and mist coats cover nearer 10m², and masonry paint about 7m² on smooth render.
Do I need two coats of paint?
Usually, yes. Two coats give an even colour, especially over a darker colour or patched areas. New plaster needs a mist coat first, then two full coats.
Should I take off the doors and windows?
Yes, roughly 1.9m² for a door and 1.5m² for a window. In a small room that can save a litre or more.
