Total painted surface
Paint area × coats
084 · REAL ESTATE & CONSTRUCTION
Paint & Wallpaper Quantity Calculator
Calculate theoretical paint volume and recommended paint containers or wallpaper rolls from area, coats, product coverage, usable roll area, and waste.
LOCALCALCULATE IN YOUR BROWSER
LOCALValues are calculated locally in your browser and are not sent to a server.
Enter the product coverage and container volume yourself. No product-specific default is fixed.
Theoretical paint required11 L
Recommended containers3
Total painted surface100 ㎡
Area incl. waste110 ㎡
Product specifications10 ㎡/L · 4 L
Total = Area × Coats
Adjusted = Total × (1 + Waste / 100)
Paint Volume = Adjusted ÷ Coverage
Containers = ceil(Paint Volume ÷ Container Volume)
HOW TO USE
How to use
- 01
Choose the Paint or Wallpaper tab.
- 02
Enter the work area and product specifications yourself.
- 03
For paint, enter coats and coverage; for wallpaper, enter usable area per roll.
- 04
Enter a waste rate to see adjusted area and purchase-unit quantities.
- 05
Review theoretical quantity separately from rounded purchase quantity, then copy the summary if needed.
- 06
For example, 50 m² with 2 coats, 10 m²/L coverage, and 10% waste requires 11 L; with 4 L cans, the recommended purchase quantity rounds up to 3 cans.
MATERIAL QUANTITY FORMULA
Paint and wallpaper quantity guide
Including waste
Total area × (1 + waste/100)
Paint volume
Adjusted area ÷ coverage
Containers
Paint volume ÷ container volume, rounded up
Wallpaper rolls
Adjusted wallpaper area ÷ usable area per roll, rounded up
Product specs
Coverage, container volume, and roll area are user inputs
IMPORTANT NOTES
Important notes
- Coverage varies by product, surface, and application method, so enter the product specification yourself.
- Usable wallpaper area per roll can vary because of pattern matching and cutting.
- Waste rate is a reference input and does not guarantee actual waste.
- An area calculated in Tool 083 is not automatically the entire paint target.
- Rounded purchase quantities are reference values and do not guarantee the actual amount to buy.
- Site conditions such as wallpaper pattern repeats, cutting around corners and openings, primer requirements, and surface absorption should be considered separately from the calculator inputs.
FAQ
Frequently asked questions
01What is the total painted surface for 50 m² with 2 coats?+
50 m² × 2 coats = 100 m².
02At 10 m²/L coverage, how much paint is needed for 100 m²?+
With 0% waste, the theoretical amount is 10 L.
03What happens with 10% waste?+
100 m² becomes 110 m² adjusted area, requiring 11 L at 10 m²/L.
04If 11 L is needed and cans are 4 L, how many cans are recommended?+
11 ÷ 4 = 2.75, so the purchase unit is rounded up to 3 cans.