Wall Area and Paint Planning Without Overbuying
Subtract openings, include coats, and keep a reasonable reserve.
What it does and when to use it
Floor area is not paint area. Walls are perimeter multiplied by height, then windows and doors are subtracted.
What information to enter
Measure each wall, height, openings, number of coats, and container coverage from the manufacturer.
How to understand the result
Dark colors, absorbent surfaces, or major color changes may require primer and an extra coat.
Recommended step-by-step workflow
- Check the assumptionsFloor area is not paint area. Walls are perimeter multiplied by height, then windows and doors are subtracted.
- Use matching unitsMeasure each wall, height, openings, number of coats, and container coverage from the manufacturer.
- Compare with another scenarioDark colors, absorbent surfaces, or major color changes may require primer and an extra coat.
Short example
A 4×3 m room at 2.7 m height has 37.8 m² of wall area before subtracting openings.
Common mistakes
- Using floor area to estimate wall paint.
- Assuming stated coverage applies to every surface.
Frequently Asked Questions
How much reserve should be bought?
Keep a small amount for touch-ups, not excessive stock that may age.
Is the ceiling included?
No, unless the floor area is added as ceiling area.
Are my personal inputs saved?
No. The calculators and guides are designed for quick browser use without storing your personal input values.