The average size of a used clawfoot tub is approximately five feet long. These measurements were made to fit a standard post-world War 1 bathroom in the United States. The specific measurements, on average, are 60.5 inches long by 30 inches wide and 24 inches tall. They'll typically have a 12.5-inch water depth and a 4-inch roll around the rim. Keep in mind that, because of their size and the fact that they’re made from iron, they can weigh up to 350 pounds.