Paint Calculator (Litres for a Room)
How many litres of paint you need for a room — wall area minus doors and windows, number of coats and coverage.
Result
How to use
- 1
Enter the room's length, width and wall height in feet.
- 2
Add the number of doors and windows, coats and the coverage from the paint tin.
- 3
See the paintable area, litres needed, a tin combination and the cost.
Questions
How much area does 1 litre of paint cover?
Most interior emulsions cover about 100–140 sq ft per litre per coat on a smooth, primed wall; textured or porous walls need more. Exterior and enamel paints differ — the coverage is printed on every tin.
How many coats of paint are needed?
Two coats over a primer is standard for new walls or a colour change. A single fresh coat may do when repainting the same light colour.
Should I include primer and putty?
Yes for new plaster or patchy walls. Primer coverage is similar to paint, so run the calculator again with 1 coat for primer. Putty is sold by weight — check the coverage printed on the bag.
About this Paint tool
Paint Calculator (Litres for a Room) — How many litres of paint you need for a room — wall area minus doors and windows, number of coats and coverage. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Enter the room's length, width and wall height in feet.
Related reading
Articles that go with this tool
One Phone-Free Sunday: What a Day Without Scrolling Taught Me
I switched off my phone for one full Sunday. The first hour was hard, the rest of the day was the calmest I’d had in months. Here’s what happened, and how you can try it too.
Kids and Screens: A Practical Guide to Healthy Screen Time for Indian Families
Phones keep kids quiet — but at what cost? What WHO recommends for young children, warning signs to watch, and simple family rules that actually work.
Simple Living and Decluttering: Owning Less, Living More
Cupboards full of things we never use, and minds full of noise. A gentle, practical guide to decluttering your home and simplifying your life — without becoming extreme.
Related tools
More everyday tools you may like
Results are estimates to help you plan. They are not financial, tax or medical advice.