Quickly estimate the paint required for your walls.
Our Paint Calculator helps you estimate how much paint you may need for your home painting project. Enter your wall dimensions, consider the number of coats, and use the result to plan your paint purchase. It is useful when refreshing a bedroom, living room, dining area, or another interior space.
Start by measuring the length and height of each wall you want to paint. Multiply each wall's length by its height to calculate the wall area, then add the areas together. If you do not plan to paint doors or windows, subtract their areas from the total.
For example, a wall measuring 12 feet long and 10 feet high has an area of 120 square feet. If four walls have the same dimensions, their combined area is 480 square feet before subtracting openings.
The following examples use an illustrative coverage rate of 100 square feet per litre for one coat. Actual coverage depends on the paint product, wall condition, surface texture, and application method.
| Paintable Area | Coats | Estimated Paint |
|---|---|---|
| 200 sq ft | 1 | 2 litres |
| 400 sq ft | 2 | 8 litres |
| 600 sq ft | 2 | 12 litres |
The amount of paint required depends on the size of the surface, the number of coats, and the coverage stated on the paint container. Rough or porous walls may absorb more paint than smooth, properly prepared surfaces. A major colour change, primer requirements, and the condition of an existing finish can also affect the quantity needed.
Always check the manufacturer's coverage information before buying paint. Keep in mind that the calculator provides an estimate rather than an exact guarantee. Purchasing a small additional quantity may help with touch-ups, but plan according to your surface and product instructions.
Choosing the right paint colour can change the appearance and atmosphere of a room. Consider your lighting, furniture, flooring, and existing colour scheme before deciding on a finish. Measure your walls carefully to avoid unnecessary purchases and help organise your home improvement budget.
Explore more resources from Interiors Industries to continue planning your space and finding practical interior design ideas.
