I am just starting pe but I decided excel could be a very useful tool to track and graph gains. I have a column for every measure day which is going to be 40 days apart. I have a row for length, girth, and then volume. Volume is (LxG^2)/12.56666(or 4pie). The volume row is just the formula I put in the last row and dragged across the columns; so when I type in my length and girth the volume is calculated automatically to save time. Now I can track and analyze all aspects of my penis growth and see I've I'm progressing correctly to my goal. And it's always fun to look at charts. Marshall's Charts & Graphs - YouTube. I hope I am able to link that. Please warn me if that's not allowed.