Paint Calculator: How Many Litres of Paint for a Room?
Free tool · Updated October 2, 2026 · By CouponTalk
Your result
Enter your measurements to see your result.
Quick answer
Paintable area = 2 × (length + width) × height, minus doors and windows. Interior emulsion covers roughly 100–140 sq ft per litre per coat, depending on the brand and wall. A 12 × 10 ft room with a 10 ft ceiling, one door and one window has about 400 sq ft of wall, so two coats need about 7 litres of paint.
How to use this calculator
- Measure room length, width and wall height.
- Count doors and windows (we deduct 21 sq ft per door and 15 sq ft per window).
- Check the coverage on the paint tin and set the number of coats.
Formula
Wall area = 2 × (Length + Width) × Height − 21 sq ft per door − 15 sq ft per window
Litres = Area × Coats ÷ Coverage per litre per coat
These are typical figures for Indian homes. Check the product spec sheet, and ask an electrician or installer before you buy or fit anything.
Frequently asked questions
How much paint for a 10 x 12 room?
About 6–8 litres for two coats on the walls, depending on paint coverage and how many doors and windows there are.
Do I need primer?
Yes for new plaster, a big colour change or patched walls. One coat of primer usually covers 90–120 sq ft per litre.
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