Calculate paint quantity needed for your projects instantly
m²
Enter the total surface area you plan to paint in square metres
m²/L
Enter the coverage rate of your paint in square metres per litre
coats
Enter how many coats of paint you plan to apply
Total Paint Required—
Paint Cans Needed (5L buckets)—
Estimated Cost ($15/L)—
What does this mean? The calculator shows the total litres of paint required for your project, how many 5-litre buckets you'll need to purchase, and the estimated cost at $15 per litre. Use these results to plan your shopping and budget accordingly.
How to Calculate Paint Coverage
Calculating the right amount of paint for your project is essential to avoid running out mid-project or purchasing excessive quantities. Our Paint Coverage Calculator simplifies this process by determining precisely how much paint you need based on three key factors: the total area to be painted, the paint's coverage rate, and the number of coats required.
Understanding Paint Coverage Rate
The coverage rate of paint, measured in square metres per litre (m²/L), indicates how much surface area one litre of paint can cover. Most standard emulsion paints cover between 10-15 m²/L on smooth surfaces. However, textured surfaces, porous materials like brick or concrete, and darker colours may require more paint. Always check your paint tin's label for the manufacturer's specified coverage rate, as this varies by paint type and quality.
Calculating Total Paint Required
To determine total paint needed, multiply your total area by the number of coats, then divide by the coverage rate. For example, if you're painting 150 m² with 2 coats and your paint covers 10 m²/L, you'll need: (150 × 2) ÷ 10 = 30 litres. This calculation accounts for the fact that multiple coats require proportionally more paint.
Determining the Right Number of Coats
Most interior projects require 2 coats for even colour coverage and durability. However, some situations may require more: when covering dark colours with light paint, using low-quality paint, painting over stains or marks, or working with bold accent colours. Conversely, high-quality paints might achieve good coverage with just 1 coat. Exterior projects typically need 2-3 coats for weather protection.
Converting Litres to Paint Cans
Our calculator converts the total litres needed into the number of standard 5-litre buckets you must purchase. If your calculation shows 32 litres needed, you'll require 7 cans (since 6 cans = 30 litres, requiring a 7th for the remaining 2 litres). Always round up to ensure you have sufficient paint—it's better to have leftover paint than to run short during application.
Budgeting for Your Paint Project
The estimated cost calculation assumes $15 per litre, providing a rough budget baseline. Actual costs vary significantly based on paint quality, brand, and current prices. Premium paints may cost $20-30 per litre, while budget options might be $8-12 per litre. Consider that premium paints often provide better coverage and durability, potentially offering better value despite higher upfront costs. Always check current prices at your local retailer for accurate budgeting.
What if my coverage rate is different from what I entered?
Check your paint tin's label for the exact coverage rate specified by the manufacturer. Coverage rates vary by paint type, finish, and surface texture. Using an inaccurate coverage rate may result in purchasing insufficient paint. If painting a textured surface, the coverage rate will typically be lower than for smooth walls.
How many coats of paint do I actually need?
Most interior projects require 2 coats for even coverage. However, you may need 3 coats when painting light colours over dark walls, painting with lower-quality paint, or covering stains and marks. Exterior projects usually need 2-3 coats for weather resistance. Prime any new surfaces or repairs before applying topcoats.
Why should I round up the number of paint cans?
Always round up to the next whole can to ensure you have sufficient paint. Running out mid-project is costly and inconvenient, and you won't achieve perfect colour matching if you purchase more paint later from a different batch. Having a little extra paint is useful for future touch-ups.
Does paint coverage differ by colour?
Yes, darker colours and bold hues often have lower coverage rates than lighter colours because they require more pigment. When changing to a significantly different colour, you may need extra coats and more paint overall. Always test the coverage on a small area first if you're unsure.
What surfaces require more paint than average?
Textured surfaces like brick, concrete, stucco, and textured drywall absorb more paint than smooth surfaces. Porous or previously unpainted surfaces also consume more paint. Exterior surfaces exposed to weather typically require thicker application and additional coats compared to interior walls.