Paint Calculator — How Much Paint Do I Need?
The Paint Calculator tells you exactly how many litres of paint you need for your room. Overestimating wastes money; underestimating means a second trip to the store mid-project. Enter your room dimensions and the coverage per litre (typically shown on the paint tin) to get an accurate quantity including a 10% safety margin.
How to Use This Calculator
- 1
Measure the total wall area in square metres (height × perimeter, minus doors/windows).
- 2
Select the number of coats you plan to apply.
- 3
Enter the coverage per litre from your paint tin (typically 10–15 m²/L).
- 4
Click Calculate to see the litres needed including a 10% safety margin.
Frequently Asked Questions
Total wall area = (wall height × room perimeter) minus area of doors (~1.8 m²) and windows (~1.2 m² each). Perimeter = 2 × (length + width).