Calculator
Calculate paint to buy
Enter the room dimensions. The calculator estimates the litres needed for each wall, the ceiling, and the total.
Dimensions
Settings
Default coverage: 10 m²/L. Adjust based on your paint data sheet and the condition of the surface.
Results
Total surface (m²)
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Walls + ceiling (including coats)
Total paint (L)
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Breakdown by surface
| Surface | Dimensions | m² (incl. coats) | Litres |
|---|---|---|---|
| Wall (width) ×2 | — | — | — |
| Wall (depth) ×2 | — | — | — |
| Ceiling | — | — | — |
Formula: walls = 2×(width×height) + 2×(depth×height); ceiling = width×depth. Litres = (m² × coats) / coverage.
Quick tip
If the surface is very porous or you are changing color (dark → light), allow a buffer. This calculator does not subtract doors/windows.