The third dimension is reqired. How deep your pool is?
For example, if the depth equals 5 ft
18 x 36 x 5 = 3240 cubic feet and contains 24236.88 liquid gallons
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About 7,600 gallons
If that is 4 feet tall and 18 inches in diameter, it would be 16.83 gallons.
10000
7,646 gallons.
18 x 33 x 5 = 2970 cubic feet 1 cubic foot = 7.48052 gallons therefore, your pool is 22217.1 gallons