My dictionary tells me that there are 231 cubic inches in an American gallon. Thus
1 cubic inch is ^{1}/_{231} = 0.004329 gallons.
A cubic foot is 12 inches by 12 inches by 12 inches and hence
1 cubic foot = 12 12 12 = 1728 cubic inches.
Hence
1 cubic foot = 1728 cubic inches = 1728 0.004329 = 7.48 gallons.
Penny
