Estimate how much paint to buy from wall measurements, door and window areas, and your product’s coverage.
Your input
Outputs are cleared when the input changes.
Result
Enter your data or use the example, then run the tool.
Worked example
40 m² minus 4 m², two coats and 10 m²/L gives 7.2 L, or 7.92 L with 10% extra: two 5 L cans.
Method
Multiply each wall’s length by its height and quantity, then subtract doors and windows. Multiply the paintable area by the number of coats, divide by coverage per litre, and add your extra allowance. Round up to whole cans.
Limits
Use the coverage shown on the paint you plan to buy. Doors and windows cannot exceed the wall area. Surface condition and application affect real usage; this tool estimates quantity, not application or drying safety.
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