For a round above ground pool, the calculation is:
Diameter x Diameter x Depth X 5.9 = Number of Gallons
Please note that the depth is the ACTUAL water depth NOT the height of the pool wall (the water is usually around 6 inchs lower than the wall height).
For your example:
For a 24-foot round pool with a actual water depth of 3.5 ft: 24x24x3.5x5.9 = 11,894 or around 12,000 gallons.
1,770 gallons.
2,360 gallons.
About 19,355 gallons.
9,440 gallons.
26,550 gallons.
3,398.4 gallons.
5,974 gallons.
1,770 gallons.
6,200 gallons.
Three feet of water in a 12-foot round pool is about 2,550 gallons.
About 5,310 gallons.
About 13,010 gallons.
2,360 gallons.
About 19,355 gallons.
9,440 gallons.
26,550 gallons.
About 212 gallons.