It depends on its dimensions
Well my pool is 14' round an 36" deep an it took 2200 gallons so your probably looking at around 5000 gallons.
18,506 U.S. gallons
1,070 U.S. gallons
196 cubic feet is the volume of your pool. Converted to U.S. gallons would be, drum roll please...1,469 gallons.
7.6 thousand gallons you can use a pool calculator at www.aquachem.com
Your round pool has a volume of 2463 cubic ft. The formula to achieve this is Pi * (radius squared) * depth of 4 ft. Converting this to U.S. Gallons comes to 18,425 gallons.
An above ground pool 18x33 - 4ft deep holds about 14k gallons of water. An 18x33 - 4ft above ground pool has about 14k gallons of water.
If it is a round 18' in diameter and a constant 52" deep then the volume is 158.6 gallons per inch. 52 inches would then be 8247.2 gallons.
10053.82 gallons (US) 8371.568 gallons (UK)
8000 Gallons -- ANSWER -- For every foot of water in the pool there is 1,585 imperial gallons.