None.
A square foot is a measure of area whereas a gallon is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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you will need 5 cans of paint.
1 gallon of paint to cover about 350 square feet You need slightly more than a gallon if the walls are unpainted drywall, which absorbs more of the paint
600 sq ft
12 (square feet) = 1.33333333 square yards
43,560 square feet = 1 acre.