What does this tool do?
Paint quantity follows the paintable area and the number of coats. This calculator adds the four walls and, optionally, the ceiling, then divides by a coverage of about 10 m² per litre per coat.
The Formula
Litres = (Wall area + Ceiling area) × Coats ÷ 107.6Frequently Asked Questions
How much paint for a 15 × 12 ft room?
Walls and ceiling need about 11.4 L for two coats, allowing 10 m² per litre.
Do I need to subtract doors and windows?
For a quick estimate, no. For larger openings or many windows, deduct the area and buy a little extra anyway.