A 12 x 24 foot rectangular pool filled to a uniform depth of 4 feet contains 8,640 gallons of water. If the shallow end is 4 feet and the deep end is 8 feet, the total gallons increases to 12,960.
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Dupont offers this formula: Long diameter x short diameter x average depth x 5.9 = Total Gallons. So, 12 x 24 x 4 x 5.9 = 6,796.8 gallons.
A 24-foot round pool filled to a depth of four feet contains 13,593.6 gallons of water.
This size pool (assuming the depth is 4 feet throughout the whole pool) would contain about 8,640 gallons of water.