How many ounces are there for a bath tub

970 fluid ounces and in gallons that would be 7.5 gallons

This type of keg contains the equivalent of 165 12 fluid ounces cans of beer. It's about half as big as a Bathtub. In other words, 2,560 fluid ounces is 0.47 times the size of a Bathtub, and the size of a Bathtub is 2.1 times that amount. The capacity of a typical bathtub is 5,400 fluid ounces.