Paint Calculator
Estimate how many litres of paint, primer and putty a room needs. Estimate · coverage varies by brand and surface
How it works
How to use the paint calculator
The paintable wall area of a room is its perimeter × height: 2 × (12 + 10) × 10 = 440 sq ft for a 12 × 10 ft room with 10 ft walls. Subtract doors (about 21 sq ft each) and windows (about 15 sq ft each), and add the ceiling if you're painting it too.
Litres needed = area × coats ÷ coverage per litre. Interior emulsions in India typically cover roughly 90–140 sq ft per litre per coat on a smooth, primed wall, and the exact figure is printed on the tin, so change the coverage to match your product. Two coats is the usual finish; new plaster also needs a coat of primer, and rough walls may need putty first.
Textured walls, dark-to-light colour changes and porous surfaces use more paint. Round up to the next tin size and keep a little for touch-ups.
- Enter room length, width and wall height in feet.
- Add the number of doors and windows.
- Set coverage from the paint tin and number of coats.
- Tick ceiling, primer or putty as needed and read the litres.
FAQ
Questions about this tool
How much area does 1 litre of paint cover?
Usually around 90–140 sq ft per coat for interior emulsion on a smooth surface. Check your paint's label.
How many coats of paint are needed?
Two coats is standard; new walls also need primer, and strong colour changes may need a third coat.
Is putty always needed?
Only on uneven or new walls for a smooth finish. The putty figure is a rough estimate.
Can I use it for exterior walls?
Yes, but use the exterior paint's coverage and allow for texture.
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