Paint Coverage Calculator
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Paint Coverage Calculator
Calculate paint needed for your room project.
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Category:
Home Improvement & DIY Calculators
Difficulty:
Easy
Times Used:
372
Last Updated:
Feb 2026
Recent Calculations
Paint Coverage Calculator: Never Run Out or Overbuy
Calculate exactly how much paint you need — for walls, ceilings, doors, trim — in liters or gallons. Accounts for coats, surface type, and waste. Save money and time on your DIY project.
Example: 12m² wall, 2 coats = ~2.4L | 300 ft² room = ~0.8 gal (2 coats).
Standard Paint Coverage per Liter/Gallon
| Surface Type | m² per Liter | ft² per Gallon |
|---|---|---|
| Smooth drywall (primed) | 10–12 | 400–450 |
| Rough plaster / brick | 6–8 | 250–300 |
| Wood siding | 8–10 | 300–350 |
| Ceiling (textured) | 8–10 | 300–350 |
| Doors & trim | 12–15 | 450–500 |
Rule of Thumb: 1 liter covers ~10 m² (1 coat) on smooth walls. Always buy 10% extra for waste.
How to Measure & Calculate
- Measure walls: Height × Width per wall (skip windows/doors or subtract later)
- Ceiling: Length × Width
- Subtract openings: Door (~2 m²), Window (~1–2 m² each)
- Choose coats: 1 for refresh, 2 for color change or new drywall
- Enter values → get exact liters/gallons
Real Project Examples
Bedroom (3m × 4m × 2.5m)
Walls: 35 m² | 2 coats | Smooth = 7 liters
Living Room + 2 Doors
Walls: 50 m² - 4 m² doors = 46 m² | 2 coats = 9.2 liters
Pro Painting Tips
Save Paint
- Prime bare drywall (+20% coverage)
- Use quality roller (less splatter)
- Stir well, don’t thin unless needed
Avoid Mistakes
- Don’t forget ceiling!
- Dark colors need 3 coats
- Buy all cans from same batch
Why Trust This Calculator?
>Accuracy: Based on ISO 6504 & paint manufacturer data (Sherwin-Williams, Dulux, Benjamin Moore).
Privacy: No data stored. Results vanish instantly.
Updated: Nov 2025 with real-world coverage rates.
Frequently Asked Questions
Walls: ~320 ft² → 2 coats = 0.8–1 gal (smooth walls)
Yes for bare drywall, stains, or dark-to-light change. Primer = 1 coat, then 2 finish coats.
Usually 1–2. Textured ceilings need more paint (lower coverage).
Not recommended — color and finish may vary. Buy all from same batch.
Yes! Add to home screen → works without internet.