18 feet.
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If this is a round pool 18 feet across and you fill it with 4 feet of water, it contains 7,646 gallons of water.
21 inches of water in a round pool that is 27 feet 3 inches across is about 7,667 gallons.
A round pool that is 16 feet across and is filled with 48 inches of water will contain about 6,041 gallons of water.
If the pool is 26 feet around, then its circumference is 26 feet. If the pool is 26 feet across, then its circumference is 81.7 feet.
A 12-foot wide round pool with 3.3 feet of water contains 2,803.7 gallons of water.