Tool
How much paint do I need?
Measure the room and count the doors and windows. We work out the litres, and the tins to buy with the least left over. Filled in: a 12 × 10 ft room, 9 ft high (3.6 × 3 × 2.7 m), walls and ceiling.
What you need
43.1 m² to paint: 9.5 L of emulsion and 4 L of primer, about ₹4,130.
To paint43.1 m² (464 sq ft)
Walls 32.3 m² after doors and windows · ceiling 10.8 m²
Interior emulsion, 2 coats9.5 L
Tins: 10 L (0.5 L spare)₹3,350
Wall primer, 1 coat4 L
Tins: 4 L₹780
Tins, totalabout ₹4,130
Prices indicative, incl. GST. Tinted at the counter.
How we work it out
We take the wall area (round the room, times the height), take off 1.9 m² for each door and 1.4 m² for each window, and add the ceiling if you paint it. We multiply by the coats, divide by what a litre covers in one coat (about 10 m² on a smooth wall), add 5% for touch-ups and round up to the next half litre. Primer is one coat, at about 11 m² a litre. Then we pick the tins with the least left over, and one big tin over a pile of small ones.
Rough walls, new plaster and a dark wall going light all take more. Bring the numbers to the counter and we check them with you.