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For round pools. All calculations using feet not inches. Multiply pool diameter x pool diameter x pool depth x 5.9 = gallons

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Wiki User

14y ago
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Wiki User

15y ago

18 feet round X 54 deep comes out to about 8,505gal. geterdone

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Wiki User

13y ago

7.48 gallons in one cu ft

Pool is 3.14x 21x21x54/12/4 = 1558 cu ft x 7.48 = 11,653 gallons

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Anonymous

Lvl 1
3y ago

I don’t know

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Q: How many gallons of water in a 21 foot round pool 54 inches deep?
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