A pool with a 52-inch wall has about 48 inches, or four feet, of water in it. The formula is (Pi)r2h, where r = 14, h = 4, and Pi = 3.14. Multiply that result by 7.5 to convert from cubic feet to gallons. That should give you about 18,500 gallons.
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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.
The depth is required. But the equation would be length x height x depth x 7.5 I believe.
Assuming the 28 feet is the diameter, 17,436 litres, or 3,835 UK gallons, or 4,606 US gallons for each foot of depth
If the pool is 8 feet in the deep end and 3 feet in the shallow end, the total volume will be about 59,900 gallons of water.
If this is a 28-foot round pool filled to a standard depth of four feet, the total volume would be about 18,500 gallons of water.