Anywhere from 300-500 square feet depending on the thickness/thinness of the paint, how many coats you're putting on from a single can, and how large the surface is you're painting.
However, 300-500 square feet is an approximate average of how much a gallon of paint should cover.
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You can calculate the amount of paint needed by finding the square footage of the room to be painted. Each manufacturer has a recommendation as to how many square feet a gallon of paint will cover. Make sure to calculate for primer if needed and or a second coat of finish.
If your drum is a 55 gallon drum and your paint can cover 400 square feet per gallon then you may cover (one coat only) a square almost 150 by 150 feet.
He covered 115 square feet per gallon. - Way below the average, which is about 280 sf per gallon.
About 250 sq. ft.
A gallon of paint one coat will cover about 300 square feet; if surface is very smooth about 400 sq ft,and if very rough maybe 150-200 sq feet