Litres and cans of paint for a room’s walls and ceiling, with door and window openings subtracted — set coats and coverage and get instant quantities. Free, no sign-up, runs in your browser.
Room
Openings (not painted)
Tip: a standard single door is ≈1.9 m² (0.9×2.1 m); a typical window ≈1.5 m² (1.2×1.25 m). Edit the areas to match your joinery schedule.
Paint
Coverage is a rule of thumb — most emulsions cover 10–12 m²/L per coat on sealed plaster; porous, textured or dark substrates cover less. Check your product’s datasheet.