It should take around 30,457 gallons to fill that pool.
Using the Volume formula (pi * radius^2 * height), I determined that the pool was roughly 4071.5 cubic feet. I then used Google calculator to convert this to gallons.
If you fill it to four feet deep, the total is 10,408 gallons of water.
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.
4500 gallons
4,625.6 gallons.
The volume of the pool is 2,290.2 cu ft and has a maximum capacity of 17,133.2 gallons of water.
Three feet of water in a 12-foot round pool is about 2,550 gallons.
If you fill it to four feet deep, the total is 10,408 gallons of water.
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.
Twelve feet of water in a 10-foot round pool is approximately 7,080 gallons.
4500 gallons
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.
4,625.6 gallons.
A pool this size with an average depth of 16 feet requires 462,560 gallons of water to fill it to the top.
(3.5 feet) * PI * ((9 feet)^2) = 6 662.46122 US gallons
The volume of the pool is 2,290.2 cu ft and has a maximum capacity of 17,133.2 gallons of water.
Depends on the depth of the water. If you go to four feet deep the total would be about 13,594 gallons.
Using 24 feet x 4.5 feet as true measurements it would take 15,220 gallons of water to fill the pool.