How to Calculate Paint Quantity for Your Room

Measure each wall's length and height in feet. Multiply length x height for each wall and add them up. Subtract area for doors (21 sq ft each standard) and windows (15 sq ft each standard). Example: A 12x10 foot room with 10-foot ceilings = 2(12x10) + 2(10x10) = 440 sq ft. Minus 1 door and 1 window = 440 - 21 - 15 = 404 sq ft. Add ceiling if painting it: 12x10 = 120 sq ft. Total: 524 sq ft.

Every paint can lists coverage in sq ft per litre. Typical rates: Interior emulsion: 100-130 sq ft per litre per coat. Exterior emulsion: 80-100 sq ft per litre per coat. Primer: 100-140 sq ft per litre. Putty: 20-25 sq ft per kg. These rates assume smooth, primed walls. Rough or unprimed walls consume 20-30% more paint.

Standard painting requires: 1 coat primer + 2 coats paint. For dark-to-light colour changes or fresh walls: 1 coat primer + 3 coats paint. For same-colour repaints in good condition: 2 coats paint may suffice. Always plan for 2 coats minimum — one coat never gives a uniform finish.

Add 10% for wastage (tray residue, roller absorption, spills). So the final formula: Paint needed = (Total area ÷ Coverage per litre) x Number of coats x 1.10. Example: 524 sq ft ÷ 120 sq ft per litre = 4.37 litres per coat. x 2 coats = 8.73 litres. x 1.10 wastage = 9.6 litres. Buy 10 litres (one 10L bucket or two 4L + one 1L). Order paint from HandyPanda for delivery across Gurgaon in 60 minutes.