According to Alliance For Water Efficiency, a standard non-jetted bathtub holds between 25 and 45 gallons of water approximately. Bathtubs are available in many sizes, a typical size being 30 inches wide and 60 inches long. The inside measurements of this tub could be 23 inches wide, 15 inches deep to the water level and 54 inches long. This tub holds about 80 gallons of water. If this is an extra deep tub, it might hold up to 110 gallons. A very small bathtub might hold 40 gallons, while a larger single person bathtub could easily hold 100 gallons or more. My bath tub holds 110 gallons (pictured above), and my 50 gallon water heater couldn’t even fill it with enough hot water to use the whirlpool jets. To start, the standard bathtub will hold roughly around 80 gallons (302 liters) of water. Much smaller bathtubs can only hold around 40 gallons (150 liters) of water, which typically are more suited for smaller children or function more as a shower space. When filled to capacity (just below the overflow), a standard bathtub holds 42 gallons, but some of that water will be displaced when you get Generally, many bathtubs still maintain the standard size of between 5 and The 30 to 50 gallons average volume is for a tub that is half full to The best way to know how much water your tub holds is to measure your own tub. of this tub could be 23 inches wide, 15 inches deep to the A standard bathtub holds 70 gallons of water. On average it takes 7 1/2 minutes to drain a bathtub. How many gallons of water go down the The capacity of an average, US, standard run-of-the-mill built in bathtub filled up to the very bottom of the overflow, which is as full as you can The standard bathtub in most American homes can hold 24 gallons of water before it begins to overflow the rim of the tub. Garden or soaking style bathtubs may Yes, the walk-in tub does use more water than a standard tub; however The standard shower is 7 minutes long and uses 7 gallons a minute.