Years ago, I was asked to write a Program to calculate the amount of fuel in a Horizontal Tank, when given the Tank Size (Length and Diameter) in inches, and the depth of fuel in inches. It is NOT an easy algorithm to come up with, from scratch. Once I had it running, I did not revisit the Issue until the Company retired the Computer and OS, as Obsolete, and then wanted to still have the Capability, on the replacement System running Windows 3.0 So I wrote an Excel Spreadsheet (Using the same algorithm) to do the job, that is still being used today. Well today I found a nice Table that does the same Job. So I thought I would Post it here.