Basic formula
Paint quantity = Area × Number of coats ÷ Coverage per litre.
Worked example
For 100 m², 10 m²/L coverage and two coats, the basic estimate is 100 × 2 ÷ 10 = 20 litres.
How to use the calculator
Enter paintable area, coverage and coats. Use the product data sheet for the most appropriate coverage figure.
Who can use it
Homeowners, painters, contractors, supervisors and estimators.
Common mistakes
Do not use generic coverage when the manufacturer gives a different figure, and remember that primer is normally a separate product.
Use the Paint Quantity Calculator
Enter your project values and get a quick preliminary calculation.
Engineering note: Results are intended for preliminary estimation, planning and learning. Verify measurements, drawings, specifications, current rates, applicable standards and site conditions before construction or safety-critical decisions.
Frequently Asked Questions
How much paint for 100 m²?
It depends on coverage and coats; at 10 m²/L and two coats, the basic estimate is 20 litres.
Should primer be included?
Estimate primer separately using its product coverage.
Does it include wastage?
The basic calculation does not automatically cover every project allowance.
Is coverage the same for every paint?
No; check the product data.