Paint Coverage Calculator
Works out how many litres of paint a wall area needs for the coats you plan and what that paint will cost.
Recent
Formula
How the calculation works
Enter the total wall area to be painted in square feet, which is the length times the height of each wall added together.
Enter the number of coats you will apply and the coverage per litre printed on the paint can, which is usually given per coat.
The tool multiplies the area by the coats and divides by the coverage for the litres, then multiplies by the price per litre for the total cost.
Common mistakes
- Forgetting the second coat, when most fresh or dark colour changes need two and the area must be counted twice.
- Using the coverage for a smooth surface on a rough wall, since porous plaster soaks up more paint and reduces coverage.
When to use it
- Use it before buying paint so you order the right number of drums instead of guessing and making a second trip.
- Use it to compare a cheaper paint with a better one, since a lower price often comes with lower coverage and needs more litres.
Worked example
A wall area of 1200 square feet with 2 coats at a coverage of 120 square feet per litre needs 20 litres, costing 9000 Taka at 450 Taka a litre.
Common questions
Should I subtract windows and doors from the wall area?
For a small job it is fine to ignore them, and for a large one subtract the larger openings so you do not buy a whole extra litre of paint you will not use.
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