Ok, so I know how important it is to know how many gallons my pool holds. I understand how to use my width, length and average depth to calculate? But how do I factor in the Grecian corners? Maybe I am getting way ahead of myself, pool not even started yet, but at age 52, I have to ask things while still fresh in my mind and I do tend to be a little OCD at times. Plans for pool: 18x36 IG vinyl grecian shape, sport pool. 3.5 on each and 5' 6" in the center. PB drew it out for us and shows a 2 feet width in the middle for the deepest part. Is it better to over or under estimate gallons? Is there another way to get this number? This may be a stupid question, but is there any way to get an exact volume as we fill it?