Volume is a 3 dimensional measurement, so 3 dimensions must be specified (length, width, depth for a rectangular pool). If it is a circle, then only need radius or diameter, and depth to calculate volume. If volume is calculated as cubic feet, then there are approximately 7.48 gallons (US) in a cubic foot.
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How many gallons of water for a 15'x30' swimming pool?
821.
How deep is the pool?
If its an oval pool approx 7800 gallons at full capacity. If its rectangular pool then approx 9000 Gallons.
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