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.
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That will depend on how deep you want the water to be.
18 x 36 ______ 108 540 ______ 648 gallons 18x36 = 648 square feet. Assume depth of pool 5 feet filled to brim, total volume 18x36x5 = 3240 cubic feet. 3240 multiplied by 6.22883 = 20181 UK gallons (rounded) 3240 multiplied by 7.48052 = 24237 US gallons (rounded)
A typical in-ground home pool contains between 20,000 and 30,000 gallons of water.
6015.77 gallons
319.2 gallons for every inch the water in it is deep.