How it’s worked out
- Wall area = 2 × (length + width) × height, minus doors (about 1.9 m² each) and windows (about 1.5 m² each)
- Add the ceiling if you’re painting it
- Litres = area × coats ÷ coverage, plus 10%
Example
A 5 × 4 m room, 3 m high, with 1 door and 2 windows, 2 coats at 10 m² per litre:
- Walls: 54 − 1.9 − 3 = 49.1 m²
- Paint: 49.1 × 2 ÷ 10 × 1.1 ≈ 10.8 litres, about three 4-litre buckets
Renovating the floor too? See the tiles calculator.