Depending on the shape and size, between 5.5 and 7 gallons per inch of depth. This is the average taking into consideration that the back rest slopes so the upper portion will have more water than the bottom per inch.: Hi, Im a Senior and our Physics teacher is making us find out how many gallons a bath tub holds…I say 55 gallons but the old hag wont listen to me. Anyways, Id be happy if youd help
