Paint Coverage Calculator
Room Length (m)
Room Width (m)
Ceiling Height (m)
Number of Coats
A paint coverage calculator estimates how many litres of paint are needed to cover a room's walls and ceiling. Standard paint covers approximately 10–12 m² per litre, depending on surface texture and paint quality.
- 1Wall area = 2 × (length + width) × height
- 2Ceiling area = length × width
- 3Total area = (walls + ceiling) × number of coats
- 4Litres needed = total area ÷ 10 (coverage rate)
- 5Deduct ~1.5 m² per door and ~1 m² per window
5×4m room, 2.4m ceiling, 2 coats=~20 litres needed (8 × 2.5L cans)
Single wall 4×2.5m, 1 coat=~1 litre
Full house repaint, 150m² walls=~30 litres per coat
| Surface | Coverage (m²/L) | Notes |
|---|---|---|
| Smooth plaster (emulsion) | 12–14 m²/L | Best coverage |
| Bare plaster (mist coat) | 6–8 m²/L | Very absorbent |
| Rough brick/textured | 6–9 m²/L | Absorbs more paint |
| Gloss/satin woodwork | 14–16 m²/L | Less absorptive |
| Exterior masonry | 4–6 m²/L | Most absorptive |
References
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