All depends on how deep the water is.
You can wet the bottom with less than 1 gallon, but it'll take more than 1 gallon to fill it 10 ft deep.
If the circumference of the pool (the distance across it through the center) is 5 ft,
then every inch of depth takes about 12.24 gallons.
How many gallons will fit into a 24 foot diameter x 4 foot high round swimming pool
5284.62 gallons
5300 Gal
18,000
13,346 gallons per vertical foot.
It is 30.6 cubic feet = 190.3 Imperial gallons.
There is NO way to calculate this without knowing how deep the pool is filled!
10,408 gallons.
28 is the diameter of the pool and 4 is the height (depth). 1 cubic foot is approx. 7.48 gallons. A round swimming pool is a cylinder. So: pi x (28/2)2 x 4 = 2463 cubic feet, multiply by 7.48 = 18423.24 gallons
7,646.4 gallons are needed.
About 24 gallons.
About 18,402 gallons.