First, determine the cubic feet of water. That is 3 feet times the width of pool time the length of pool.
So, a 50ft long pool that is 20ft wide would be 20x50x3 = 3000 cubic feet.
Then multiply by this conversion...
1 cubic foot = 7.48051948 US gallonsSo, a 3 ft deep pool that was 20x50 would have...3 x 20 x 50 x 7.4805 = 22442 gallons of water
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359 gallons for every inch the water is deep.
11,600
approximately 4,440 gallons.
A round 16-foot wide pool that is four feet deep holds about 6,000 gallons of water.
12,184