If the barrel is cylindrical in shape then its volume is 19113.4497 inches3
82.422 U.S. gallons.
68.897 Imperial gallons.
The Imperial gallon is about 20% bigger than the U.S. gallon.
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About 16.
22.032 gallons (rounded)
1 gallon = 231 cubic inches. Multiply L X W X H (in inches) to get cubic inches, then divide by 231 to get gallons. 179.53 gallons
If this is a round pool that is 27 feet across by 52 inches tall and you fill it with 4 feet (48 inches) of water, the total volume would be 17,204 gallons of water.
A cylinder 30 inches in diameter and 48 inches tall will have a volume of 33929 cubic inches. V=PI*r*r*H (V=3.1416*15*15*48) That volume is equal to 146.9 gallons (USA). (1 gal = 231 cubic inches)