I need the formula for finding the Diameter of a Cylinder using it's Volume and Height. Thanks! Here is the problem. Find Diameter of Cylinder. Volume = 1256.64 Height = 16 Inches Diameter = ? On my own... Knowing Volume = (Pi x Diameter Squared x Height) Divide by 4 I came up with this forumla for D? D = Square Root of (4V/H/Pi) Plugging in the numbers.... D = 10 Inches? Is there an easier forumla?