I just bought a new 18x18x18 tank, and I was just wondering approximatly how many gallons that is, or if anyone could tell me how to figure out how many gallons it would be. Thanks -mike

length X width X height divided by 231 = gallons 18" X 18" X 18" = 5832 divided by 231 = 25.24 gallons

(1 cubic in = 0.004329004 US gallons or 0.003604649 UK gallons) 25.24675 US gallons and 21.02231 UK gallons