Gallons is one unit used to measure the volume of a liquid. Other units include liters, cups, quarts etc. Question may be referring to the precision of the measurement. eg calculating the volume of a pool to the gallon.
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Use the formula for a cylinder to calculate the volume. This volume will be in cubic feet; you can then convert that to gallons.
You would need a 3rd dimension to calculate a volume.
Use this conversion: cubic feet x 7.4805 = gallons
To calculate the gallons, you need Lenth, Width, and Depth. Multiply them all together and you get the volume in cubic feet. There are 7.48 gallons in every cubic foot, so multiply the total volume (ft3) by 7.48. That will give you your gallons.
There are 7.48 gallons per cubic foot of interior space. You have to calculate the volume, in cubic feet, and then multiply that result times 7.48.