Paint calculator
The roller passes coat after coat across the unfolded walls; doors and windows stay masked.
The drawing
- One coat of primer
- Coat 1
- Coat 2
What you need
| Material | Calculated need | To buy | Unit price | Total |
|---|---|---|---|---|
| Paint — 5 L bucketMatt acrylic paint — 5 L bucket | 10 L | 2 bucketsexactly what you need | ||
| Primer — 5 L bucketAcrylic primer-undercoat — 5 L bucket | 10 L | 2 bucketsexactly what you need | ||
| Indicative total | ||||
Working out prices…
The formula
(42.12 m² of walls − 3.33 m² of openings + 15 m² of ceiling) × 2 coats ÷ 11 m²/L = 9.78 L.
The assumptions
- Sound, dry, prepared surface (filled, sanded).
- Indicative coverage; porous walls or a dark colour over a light one need more.
How to use it
Measure the room’s perimeter and its ceiling height.
Count the doors and windows, and add the ceiling if you paint it.
Choose the range and the number of coats: you get the buckets that leave the least over.
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