Volume of a cylinder = radius squared * PI * height
Your pools radius is 9ft, and the height is 4ft.
Volume (in sq ft) = 81 * 3.14 * 4 = 1017 cubic feet.
There are 7.5 gallons in a cubic foot, so the total gallons is 1017 * 7.5 = 7640 gallons
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Average Depth = Deep End (feet) + Shallow End (feet) divide by 2 Rectangular / Square Pool: Length (feet) x Width (feet) x Average Depth x 7.5 = Total gallons Circular Pool: Diameter x 2 x Average Depth x 7.5 = Total gallons Oval Pool: Max Length (feet) x Max Width (feet) x Average Depth x 7.5 = Total gallons Kidney Shaped Pool: Width of Shallow End (feet) + Width of Deep End (feet) x Length of Pool x 0.45 x Average Depth x 7.5 = Total gallons Free Form Pool: Max Length (feet) x Max Width (feet) x Average Depth x 7.5 = Total gallons
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