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Calculate (or approximate) the volume in cubic feet the size of your pool and multiply by 7.48. A round pool 18' in diameter, and 3' deep would be (3.14159*9*9*3*7.48)=5,710 gallons. The formula is pi (3.14159), radius squared (9*9), depth (3), and gallons in cubic foot (7.48).

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Q: How many gallons of water does an 18' pool hold?
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