5,287.7 gallons of water.
Can't say unless you tell us how high the pool is.
If this is a round pool 15 feet across and four feet deep, the maximum water capacity (filled to the very top) is 5,288.7 gallons.
How much chlorine is needed to be added to a 15ft -42" pool according to prevous answer it holds 4646.25 gallons of water
How many litres of water in a intex easy set 15ft swimming pool with a depth of 36inches?
Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.
one that is 3750 cu.ft. ...which is a 10ft deep, 15ft wide and 25ft long rectangle
16,200 Pool & Spa
If the pool were filled all the way to the top it would hold 4,551.4 gallons of water. However this is generally not recommended. If filled to within 6 inches of the top (3.5 ft) it would hold 3,976 gallons.