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Have a calculator handy? pi x r squared x depth x 7.5 = capacity in gallons. 18' pool has a 9' radius Radius squared is 9x9 or 81. Multiply 81 by pi (3.14)= 254.34. This is the square footage of the pools surface. Also good to know if you want to add a heater or some chemicals that require surface area numbers. The surface area times the depth gets you the cubic feet capacity of the pool, again sometimes good to know. So, 254 x 4' deep = 1,016 cubic feet. There are 7.5 gallons of water in a cubic foot. 1,016 x 7.5 = 7,620 gallons

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14y ago
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14y ago

Approximatly 7647 gallons of water, according to my pool records.

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14y ago

7200 gallons

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Q: How much water will an 18 foot pool by 4 feet deep hold?
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