The average bathtub, measuring 60 inches length by 30 inches wide, can hold between 35 and 50 gallons of water. The water capacity of larger fixtures, such as soaking tubs and freestanding tubs, ranges between 60 and 80 gallons. Spa or corner tubs carry 70 to 120 gallons of water on average.
Comparatively, a 10-minute shower uses anywhere from 25 to 50 gallons of water or more, depending on the showerhead. Multiplying the inner width, length, and depth in inches, and then dividing by 1,728 to convert to cubic feet, yields the maximum volume of a bathtub. Multiplying the total number of cubic feet by 7.5, which is the number of gallons in 1 cubic foot, yields the tub’s volume in gallons.
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