How many gallons of water to fill a pool that's 12' round and 30 high?

When filled to 80% water capacity, as recommended, the pool holds approximately:

10'x30" = 915 gal

12'x30" = 1,353 gal

12'x36" = 1,722 gal

15'x36" = 2,561 gal

15'x42" = 3,110 gal

16'x42" = 3,896 gal

18'x36" = 3,735 gal

18'x42" = 4,814 gal

18'x48" = 5,593 gal

24'x48" = 10,103 gal