How much paint for a 4×6 m room (24 m²)
A 4×6 m room has 50.7 m² of walls excluding the door and window and 24 m² of ceiling. Below is how much paint each surface takes in two coats.
Walls
6tins
To buy
Needed: 13.9 l
2.5 l each = 15 l
Estimated leftover: 1.1 l
Thinner: Water (5–10 %). About 1.12 l for the whole volume.
What to buy
Water-based (acrylic) paint, 2.5 l can · 2.5 l each = 15 l6 pcs
Thinner: Water · 5–10 %1.12 l
Where this number comes from
50.7 m² × 2 coats ÷ 8 m²/l = 12.7 l, + 10% reserve = 13.9 l → 6 tins of 2.5 l (15 l).
Ceiling
3tins
To buy
Needed: 6.6 l
2.5 l each = 7.5 l
Estimated leftover: 0.9 l
Thinner: Water (5–10 %). About 0.53 l for the whole volume.
What to buy
Water-based (acrylic) paint, 2.5 l can · 2.5 l each = 7.5 l3 pcs
Thinner: Water · 5–10 %0.53 l
Where this number comes from
24 m² × 2 coats ÷ 8 m²/l = 6 l, + 10% reserve = 6.6 l → 3 tins of 2.5 l (7.5 l).
Paint: interior water-based
For walls and ceilings. In kitchens and bathrooms pick a washable one, scrub class 1–2 (EN 13300).
Tip from the trade
Apply the second coat perpendicular to the first and use paint from one batch — no streaks or colour differences.
How we calculated
Ceiling height 2.7 m, one door and one window. Water-based acrylic paint, coverage 8 m²/l, smooth substrate, 2 coats, 10% reserve, 2.5 l can.
If yours differs — open the calculator and change the dimensions, it will recalculate.