231 inches cubed.
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One US gallon = 231 cubic inches.
There are 268.8 cubic inches in one dry gallon.
There is no such thing as a "cubic gallon". The term 'gallon' all by itselfrefers to a volume of space.1 cubic foot = 1,728 cubic inches1 gallon = 231 cubic inches1 cubic foot = 7.481 gallons (rounded)1 gallon = 0.13368 cubic foot (rounded)
There are 0.13368 cubic feet in a gallon.
There are approximately 3,785,411.78 cubic millimeters in one US gallon.