d*2*pie/4*l*0.785 Were d is Daimeter of the job, Pie value is 3.142, l is Lenght of the job.
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Use the formula for a cylinder to find out the volume. Then multiply the volume by the density of steel (about 7900 kg/m3 - but it may vary slightly depending on the type of steel).
Since we want to calculate the weight of a cylinder, the formula is W = V*D. Or, Weight = Volume*Density. [πr²h is the formula for volume. Pi [3.14159...] x radius squared x height. Simply substitute if you have all aspects of the formula.]
Relative gravitational potential energy.