Wall paint calculator

Calculate how many liters of paint and cans you need from area and number of coats.

Liters of paint

8 L

18 L cans1

3.6 L gallons3

Coverage varies by paint and surface (10–14 m²/L is common). Check the package.

How the calculation works

Liters = (area × coats) ÷ coverage. Add walls and ceiling and subtract large doors and windows to estimate the area.

How many coats do I need?

Usually 2 coats. Strong colors or big color changes may need 3.

Find out how many boxes of flooring or tile to buy for a room, including waste margin.

Updated on June 17, 2026 · by Rafael Rossi · Methodology & sources