To determine the amount of volume in an area, you need 3 dimensions. the length(18') and width(4') are give, but the third dimension, height, is missing. To find the answer to this question, measure how deep the pool is and plug the numbers into the formula: Length x Width x Height. The product is measured in cubic feet(ft3)
For example, say the depth is 5 feet.18' x 4' x 5' = 360 feet3 of water
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48*18=864
About 7,645 gallons.
The pool volume is 3.14 x 18 x 18 X 4/4 = 1017 cu ft - that's how much water you will need. 1017 cu ft = 7600 gallons
359 gallons for every inch the water is deep.
6000