One gallon covers 400 sq ft on a smooth surface one coat. For rougher surface, much less per gallon, 200-300 sq ft oer coat.
One gallon costs between $20-$50 depending on quality.
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It depends on the kind of paint it can veri from 39 ft to 50 ft if used right Improved Answer: Even a high build elastomeric paint goes 80 square feet a gallon. A standard gallon of paint has a theoretical coverage rate of 400 sq ft. However, this amount will be reduced on a porous or textured surface as much as half.
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About 1500 sq ft
2 gallons Um, beg to differ.... 20x10=200 x 2 walls...400 sq ft 15X10=150 X 2 walls...300 sq ft 20x15=300sq ft 400+300+300=1000 divided by 150sq ft = 6.67 gallons....if all of the information we have is correct. (this does not take into account doors or windows for which you have not given us any information on) What type of paint are you using that only estimates 150 sq ft per gallon coverage?? Be aware that sometimes the coverage sq ft estimate will vary depending on the surface, existing paint, and the method of application.
Time how long it takes to paint 10 sq ft. To paint 2000 sq ft would therefore take 200 times as long. With a roller on a prepared wall and a competent painter then 10 sq ft could be painted in less than 1 minute so 2000 sq ft would take 3 -4 hours.