10×10 room represented as 10 by 10 feet or 100 square feet room, using thumb rule, dry and wet condition, for fresh painting, generally, there are 1.38 gallons or 5.2 Litres of paint is needed for a 10×10 room to cover ceiling and wall and for re-painting of 10×10 room, 0.80 gallons or 3.13 litres of paint is needed ...