There are 0.004 gallons per cubic inch in a round horizontal tank. You just said per inch, but actually, you must calculate cubic inches in order to convert to gallons. Cubic inches is calculated by: volume=pir2h. pi=3.14159 r=radius h=height radius=1/2xdiameter
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6
14.7 gallons of water.
1.6 gallons of water.
0.6528 gallon per foot (rounded)
24" x 24" x 36" = 89.8 US gallons.