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**bustacap09** Yes. So I have a either volume or % of how full the tank is. I need to figure out a way to convert this to height since the tank is one its side. I'm trying to put it into excel. I just need a formula of how to convert It. If it was a square or a cylinder upright, then when the tank is 11% full the height would be 11% and i would just do .11 times the height of the tank. But it is not, it is on its side. And since it is a hemisphere on both sides and a cylinder on it side I can't just assume that since it is 11% full the height is 11% the tank because it changes as the width of the tank changes.