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)
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That will depend on how deep you want the water to be.
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.
How many gallons of water for a 15'x30' swimming pool?
This pool can hold a maximum of about 5,707.6 gallons of water.
This pool, when filled with 4.5 feet of water, will contain about 15,300 gallons of water.