Paint Calculator
Calculate how many litres of paint you need for your walls.
📐 Paint (L) = (Wall Area × Number of Coats) ÷ Coverage per Litre
The paint calculator determines the number of litres of paint needed to cover walls, ceilings, and doors — accounting for the number of coats, surface porosity, and deductions for windows and doors. Getting paint quantity right avoids the frustration of running out mid-project (and the colour batch mismatch that follows) or wasting money on excess paint. It handles both interior and exterior wall paints and shows coverage rates for different paint types.
📋 How to Use This Calculator
Enter the room dimensions (length, width, height) or the total wall/ceiling area. Specify the number of doors and windows to deduct. Select paint type (primer, emulsion, enamel, distemper, or texture paint). Set the number of coats (2 is standard; new plastered walls often need 3). The calculator shows litres needed, number of tins (by standard pack sizes: 1L, 4L, 10L, 20L), and estimated cost.
💡 Key Facts & Information
Coverage rates per coat: Primer: 10–12 m²/litre. Interior emulsion: 12–14 m²/litre. Exterior emulsion: 10–12 m²/litre. Luxury emulsion (Asian Paints Royale, Berger Silk): 13–15 m²/litre. Distemper: 8–10 m²/litre. Enamel (for doors/metal): 15–18 m²/litre. Texture paint: 2–4 m²/litre. New plaster needs 3 coats (1 primer + 2 finish); previously painted surfaces 2 coats. Wastage: 10% for brush application; 5% for roller. Popular Indian paint brands: Asian Paints, Berger Paints, Kansai Nerolac, Indigo Paints, AkzoNobel (Dulux). Emulsion prices range from ₹200–600 per litre.