one U.S. fluid gallon is defined as 231 cubic inches.
http://en.wikipedia.org/wiki/Conversion_of_units
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1 cubic yard (yd3) = 27 cubic feet (ft3) There is no conversion for cubic yards to square feet, the units are incompatible
Volume_of_cylinder = π x radius2 x height = π x (6/2)2 x 7 = 63π cubic units. ≈ 197.92 cubic units 1 liter = 1000 cubic centimeters 1 cubic meter = 1000 liters So (assuming your measurements are in the same units) you will need to convert the 197.92 cubic units to cubic centimeters and then divide by 1000 to get the answer in liters; or convert it to cubic meters and multiply by 1000 to get it into liters.
1 gal = 4qts.
A cubic foot is a measure of volume. A yard is a measure of length. Therefore, the two units are incompatible. The corresponding unit to a cubic foot is a cubic yard. One cubic yard is equal to 27 cubic feet.
They are exactly the same, just different units.