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Look, this is simple geometry...look it up...stop playing games, you need to know some of this stuff. I really must insist! Any Way.... Total Volume of a cylinder is Radius Squared, times PI, times Height of Cylinder. 180 inches(the radius) times itself(that's Squared) times PI (Pi is 3.14) gives you the total area of a circle. The Area multiplied by the Height gives you the volume.Thus...(PI)r2 x H = V Good Lord... You do the Math. Recommend. http://library.thinkquest.org/20991/geo/solids/html The first response will get you the volume of the pool in cubic inches, but not gallons. 15 foot radius squared times Pi = 706.5 sqft. Assuming that the x 54 means 54 inches deep, that's 4.5 feet and 706.5 times 4.5 = 3179.25 cubic feet. There are approximately 7.5 gallons in a cubic foot, so 3179.25 times 7.5 = 23,844.375 gallons. Thanks for the assist, I sort of forgot about the actual question; How many gallons?

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18y ago
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14y ago

I'm assuming you mean 30 feet diameter (from one side to another)? In that case:

Calculate the volume of the cylinder (a round pool is a cylinder) using

r = radius, which is half the diameter or 15ft = 15*12 = 180 inches

h = 54 inches

pi = 3.1415

180 * 180 * 54 * 3.1415 =5,496,368 cubic inches

1 gallon = 231 cublic inches

so 5,496,368 / 231 = 23,793 gallons.

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13y ago

When filled to 80% water capacity, as recommended, the pool holds approximately:

10'x30" = 915 gal

12'x30" = 1,353 gal

12'x36" = 1,722 gal

15'x36" = 2,561 gal

15'x42" = 3,110 gal

16'x42" = 3,896 gal

18'x36" = 3,735 gal

18'x42" = 4,814 gal

18'x48" = 5,593 gal

24'x48" = 10,103 gal

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15y ago

10,000 gallons

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9y ago

About 28,913 gallons of water.

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11y ago

23,800 gallons.

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Q: How many gallons of water to fill a pool that's 12' round and 30 high?
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