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.
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You need to know the depth of the pool in order to be able to answer this question. Unless it is a round pool and you are referring to 15 as the diameter and 4 as the depth then your pool is about 5,300 gallons
How many gallons of water for a 15'x30' swimming pool?
3961
To find the gallons in a 30 foot round pool you need to: To take the radius (15) and square it (15 X 15) = 225 X pi 3.14 = 706 X a constant (7.5) = 5298 X the debth 4.5 feet = 23,844 gallons.
How deep is the pool?