well it all depends on your cubic feet of your bath tub and how high your overflow is. Lets say you have a 5' tub an shower and the highest water level you can have is 14" and you length is 46" and your width is 28" then you would have 78 gallons of water if it was full. There is 231 cubic inches to a gallon.
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There is no one answer to this question, as every bathtub is different in size. For example, a fairly standard size tub can hold anywhere from 30 to 60 gallons while larger sized bathtubs can hold over 100 gallons.