Paint Calculator — Litres of Paint for a Room
Estimate how many litres of paint a wall or room needs, at a typical coverage of 120 square feet per litre per coat.
Inputs
- Area to paint (square feet)
- Number of coats (coats)
- Coverage per litre (sq ft per litre per coat)
How this calculation works
- Paint litres = area (sq ft) × number of coats ÷ coverage per litre
- Primer is one coat and covers slightly further, so litres = area ÷ (coverage × 1.2)
Example: A 1,000 sq ft wall area with two coats at 120 sq ft per litre needs about 16.7 litres of paint plus roughly 7 litres of primer.
Frequently asked questions
How much wall area does one litre of emulsion cover?
Interior emulsion typically covers 110 to 140 square feet per litre per coat on a primed smooth surface. Rough or fresh plaster absorbs more.
How do I calculate wall area for painting?
Multiply the room perimeter by the wall height, then subtract door and window openings. Add the ceiling area separately if you are painting it.
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