The following calculations are approximate. Different variables affect the volume of the pool. These variables include: manufacturer, amount of sand on the floor, is the floor deeper in the middle. Above Ground Pools Gallons per inch Fill 48" wall Fill 52" wall 12 72 3500 3500 15 112 5000 5400 18 160 7000 7700 20 200 9000 9600 21 220 9700 10500 24 285 12500 13500 27 365 16000 17500 28 390 17500 19000 30 450 20000 21500 33 540 24000 26000 12x24 162 7000 7800 15x30 255 11000 12000 16x32 290 12500 14000 18x33 335 14750 16000 18x36 365 16000 17500 20x40 455 20000 22000 21x41 500 22000 24000 In-Ground Pools Gallons per inch 16x28 285 16x32 323 16x36 365 17x33 354 17x35 375 17x37 400 18x36 410 18x40 455 20x36 454 20x40 500 Circular Pools diameter x average depth x 5.9 Calculate   Rectangular Pools length x width x average depth x 7.58 Calculate   Oval Pools length x width x average depth x 5.9 Calculate   Freeform Pools square footage x average depth x 7.58 Calculate

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