If you mean the volume of a cylinder then divide the circumference by 2*pi to find its radius and so:-
Volume in cubic units of the cylinder = pi*radius squared*height
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You will also need the height of the cone. From circumference you can calculate the radius (circumf/Pi = radius). Volume of cone = 1/3 height x Pi x radius2
The volume of a cylinder when the inside circumference is 12 feet and height is 8 feet is: 91.7 cubic feet.
If you cannot estimate the height then, unless it is a very specific shape, you cannot calculate the volume.
(assuming its a cylinder) volume = pi * radius2 * height so: radius = square root ( volume / ( pi * height ) )
for circumference you multiply diameter by pi (22 over 7 or 3.14) and for area you do radius (half of diameter) multiplied by itself then multiplied by pi. if you want volume you can multiply the height of the cylinder by the area of it's circle.