Paint Calculator
Calculate how many liters of paint you need, based on wall area, number of coats, and coverage rate.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your wall area, number of coats, and paint coverage rate to find how many liters of paint you need.
Check your paint tin's label — coverage varies significantly by product and surface.
Your result
9.9
Paint needed (liters)
Net paintable area45
AI explanation
Formula
Paint needed = (wall area − openings) × coats ÷ coverage rate × (1 + wastage%)Worked example
50 m² wall, 5 m² openings, 2 coats, 10 m²/L coverage, 10% wastage
| Field | Value |
|---|---|
| Total wall area (m²) | 50 |
| Doors/windows area to exclude (m²) | 5 |
| Number of coats | 2 |
| Coverage per liter (m²) | 10 |
| Wastage allowance (%) | 10 |
| Net paintable area | 45 |
| Paint needed (liters) | 9.9 |
Assumptions
- Coverage rate varies significantly by paint brand, surface texture, and application method — always check the manufacturer's stated coverage on the tin rather than relying solely on the default here.
Frequently asked questions
Why does the calculator ask me to subtract door/window area?
You don't paint over doors and windows, so subtracting their combined area from the total wall area gives a more accurate paint quantity.
How many coats of paint should I apply?
2 coats is standard for most interior wall paints; a dramatic color change or a previously dark wall may need 3.
Where do I find the coverage rate for my paint?
It's usually printed on the paint tin's label, often as "coverage: X m² per liter" or similar — use that figure instead of the default for the most accurate estimate.