Question: 2 feet aquarium how many gallon?
Answer: 2 cubic feet * 1728 cubic inches per cubic foot = 3456 cubic inches. 3456 cubic inches divided by 231 cubic inches per gallon = 14.961 gallons. If you give yourself two inches of space at the top of the tank (so the fish don't jump out), that is 2.4935 gallons, so, your tank can hold 14.961 - 2.4935 = 12.468 gallons.