Math
Rectangle
Find area and perimeter from two sides.
Calculators / Construction / Paint quantity
Paint quantity calculator
Estimate paint needed for a known wall area.
On this page
Paint needed13.2L
Calculator controls
How to calculate
Estimate paint needed for a known wall area.
Litres = area × coats ÷ coverage × (1 + allowance ÷ 100)
Worked example
Paintable area (m²): 60; Number of coats: 2; Coverage (m² per litre): 10; Extra allowance (%): 10.
Paint needed: 13.2 L.
Assumptions and limits
Deduct windows and doors from area. Actual coverage depends on surface and paint; check the product label.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Required litres depend on surface area, number of coats, coverage per litre and the entered allowance.
When this tool is useful
Estimate paint quantity from the coverage stated on the product label.
Understanding your inputs
| Input | What to enter |
|---|---|
| Paintable area (m²) | Enter a number of at least 0 and no more than 1000000000000. |
| Number of coats | Enter a number of at least 1 and no more than 20. |
| Coverage (m² per litre) | Enter a number of at least 0.01 and no more than 1000. |
| Extra allowance (%) | Enter a number of at least 0 and no more than 100. |
Frequently asked questions
Should I subtract doors and windows?
Enter the actual area you plan to paint. Subtract excluded surfaces beforehand if appropriate.
Why might I need more paint?
Porous or textured surfaces, colour changes and application technique can reduce real coverage.