That all depends on how deep the water has to be, which the question neglects to specify.
Exactly 5264.1669 gallons
3961
141.06 gallons
13,594 US gallons of water.
367.2 (rounded)
Twelve feet of water in a 10-foot round pool is approximately 7,080 gallons.
Exactly 5264.1669 gallons
Three feet of water in a 12-foot round pool is about 2,550 gallons.
3961
An 18-foot round pool with 3 feet of water contains 5,734.8 gallons of water. If you fill it to 4 feet deep it increases to 7,646 gallons of water.
(3.5 feet) * PI * ((9 feet)^2) = 6 662.46122 US gallons
141.06 gallons
13,594 US gallons of water.
367.2 (rounded)
About 24 gallons.
About 18,402 gallons.
A 2-foot round pool with 12 inches of water is holding about 23.6 gallons of water.