56.52
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About 28,944.8L
fifty-six The circumference of an 18-foot diameter circular swimming pool is: 56.55 feet
If that is 4 feet tall and 18 inches in diameter, it would be 16.83 gallons.
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.
Circumference of any circle = 2*pi*radius or diameter*pi