There are 7.48 gallons per cubic foot of interior space. You have to calculate the volume, in cubic feet, and then multiply that result times 7.48.
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How many gallons of water for a 15'x30' swimming pool?
This pool can hold a maximum of about 5,707.6 gallons of water.
This pool, when filled with 4.5 feet of water, will contain about 15,300 gallons of water.
48,000 gallons of water
The Shamu Close up pool is 1 million gallons