Paint Calculator (litres of paint needed)
Enter wall area, number of coats and paint coverage to see how many litres you need.
Quick answer
1,200 sq ft, 2 coats: 20 L of paint.
How it is calculated
- Total painted area = wall area × coats = 1,200 × 2 = 2,400 sq ft.
- Paint = total area ÷ coverage per litre = 2,400 ÷ 120.
- Coverage is printed on the can; rough walls give less.
Worked example
2 coats on 1,200 sq ft of wall at 120 sq ft per litre per coat needs 20 L of paint.
| Wall area | 1,200 sq ft |
| Coats | 2 |
| Coverage per litre per coat | 120 sq ft |
| Paint needed | 20 L |
Formula
Paint needed = Ar×Co/Cv
Good to know
- Room wall area = 2 × (length + width) × height, minus doors and windows.
- Primer and putty are separate.
Questions people ask
How many sq ft does 1 litre cover?
Emulsion usually covers 100–140 sq ft per coat.
How do I find room wall area?
2 × (length + width) × height. A 12×10 room with 10 ft walls = 440 sq ft.
How many coats?
Usually 2 coats on a new wall.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0