Paint calculator: litres, primer, packs and cost for a room
A 12 by 10 ft room with 10 ft walls needs about 6.6 litres of paint for two coats, plus 2.8 litres of primer.
Estimates paint and primer for a room from its size, openings and coats, rounds up to the packs sold in India, and prices them if you enter your dealer rate.
How it is worked out: litres = (wall area minus openings) x coats / coverage per litre
Figures reviewed 10 September 2026 by 256 Grays. Checked each quarter.
Questions people ask
How many litres of paint for a 12 by 10 room?
With 10 ft walls, one door and two windows, about 395 sq ft of wall needs roughly 6.6 litres for two coats at 120 sq ft per litre per coat, plus about 2.8 litres of primer.
Can I type feet and inches?
Yes. 12′6 or 12-6 reads as 12 feet 6 inches. Switch the unit box to in or m to enter inches or metres.
What does painting a room cost in labour?
Material is this result times your dealer rate. Labour in India is usually quoted per sq ft of wall, roughly 12 to 25 rupees for emulsion over putty in 2026, so a 395 sq ft room adds about 5,000 to 10,000 rupees.
Common values
| Room | Paintable wall area | Paint, two coats | Primer |
|---|---|---|---|
| 10 x 10 ft | 355 sq ft | 5.9 litres | 2.5 litres |
| 10 x 12 ft | 395 sq ft | 6.6 litres | 2.8 litres |
| 12 x 15 ft | 495 sq ft | 8.3 litres | 3.5 litres |
| 14 x 16 ft | 555 sq ft | 9.3 litres | 4.0 litres |
Built by 256 GRAYS, an interior architecture and 3D visualisation studio in Mumbai.