mine is the same size as long as its 3 feet deep to 8 feet deep then the exactly 26730 gallons i figured that out today because we over shocked our pool by 4 times
Assuming you are referring to an 18 foot by 3 foot (36 inches) circular pool, the formula would be PIE x radius x radius x depth = cubic feet, then cubic feet x gallons per cubic foot. So here is the answer.... 3.14 x 9 x 9 x 3 = 763.02 cubic feet, then 763.02 x 7.48 (gallons per cubic foot), = 5707.39 gallons.
Diameter = total length across
Radius = half of diameter
Cubic foot = 1' x 1' x 1'
7.48 = gallons per cubic foot
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Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.
That all depends on the depth, and if it is deeper on one end. Sorry, you need more information to answer this correctly.
Do the math yourself when you find out how deep it is, start off with 18 * 36 * x ("x" being the depth.)
If the pool were to be 5ft deep throughout the whole pool exactly it would be 3240 Square feet of water. As for gallons, You would need to convert that number.
If the pool is 8 feet in the deep end and 3 feet in the shallow end, the total volume will be about 26,660 gallons of water.
You need also to specify the depth.