Depends on the shape, if it's a cylinder then find the radius of the circle on the end by measuring the diameter in feet and halving it. Then multiply it by itself and the multiply it by pi (~3.141593); this is the area of the circle in square feet. Multiply this by the length of the tank (measured in feet) to get the cubic feet.
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The volume of a round or circular tank can be found using the formula Area x height. Where area can be found by substituting the radius of the tank in the expression pi x radius x radius.