First measure the height of the aquarium, and the diameter of the aquarium in inches. Remember to account for the thickness of the glass, and the trim. Now divide the diameter by 2 to get the radius(r), and then multiply the radius by itself. Multiply that by the height(h) in inches, and multiply the whole thing by pi (3.14). This will give you cubic inches, now multiply that by 0.004329 to convert the answer to US gallons. In summary:
Volume in gallons = (pi*r2*h)(0.004329)
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