No avoiding math on this one. Here's an example:
My tank is 24 inches (0.6meters) tall and is a 34 in (0.86m) from back to front which is the radius.
Volume = pi * radius ^2 / 4 = 3.14 * 0.86 * 0.86 / 4 = 0.348 m3
0.348 m3 * (264 gallons/ 1 m3) = 91.96 gallons. My tank is listed as 92 gallons- I guess I remembered something from high school!
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