The coverage depends on the porosity and preparation of the surface being painted as well as the coverage of the paint. Look for details on the can of paint.
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It depends on the paint, and the surface that you are painting - including its preparation.
Paint coverage differs depending on brand and type of paint. Most (if not all) paint cans will indicate that one gallon covers so many square feet. For example, Paint A says one gallon covers 200 square feet. That means 200 square feet will require one gallon, 50 square feet will require one quart, 400 square feet will require two gallons, etc.
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It depends . . . check the back of the paint can -- it should tell. If not, figure 350 to 400 square feet per gallon on smoothish surfaces and perhaps 200 square feet on roughish surfaces.
The total surface area of the building is 12,000. That means you would divide 12,000 by 500 and receive an answer of 240. You need 240 gallons of paint.