Paint calculator
Estimate paint from approximate wall area, number of coats and the coverage stated on the product.
Estimate paint quantity
Check the product label. Actual coverage depends on the surface, preparation and application.How the estimate is calculated
Gross wall area ≈ perimeter × height. The calculator subtracts an assumed 1.7 m² per door and 1.8 m² per window, then multiplies by the number of coats and divides by the coverage you enter. It adds a 10% allowance for purchase planning.
Check before buying
Door and window areas are assumptions; measure actual openings for a closer estimate. Coverage depends on the product and surface; texture, porosity, color and application can change how much paint is needed. Follow the product label. This estimate does not replace a professional assessment.
Frequently asked questions
How do I include a ceiling?
Measure its area separately (length × width) and add it to the surface to be painted. The ceiling may require different preparation or a different product.
Do I need primer?
That depends on the surface, its condition and the manufacturer’s instructions. Check the label or ask a qualified professional; this calculator cannot determine preparation needs.
Does the result guarantee the exact quantity?
No. It is an estimate based on the values entered. Check product coverage and the required coats, and allow for the conditions of the job.