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In order to calculate the volume of the pool, the depth must be known. Then the volume must be multiplied by the number of gallons of water per cubic foot. The surface area of an 18-ft-diameter pool is 254.47 sq ft. Multiply that number by the depth (in ft) to find the volume. Then multiply the volume by 7.481 (gallons per cu ft) to find how many gallons the pool will hold. Example, 18-ft-dia pool x 3 ft deep 254.47 x 3 = 763.41 cu ft 763.41 x 7.481 = 5711 gallon capacity

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Q: How many gallons does an 18 foot above ground pool hold?
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