How many gallons of water are in a 24 ft round above ground pool?

That would depend on to what depth you filled the pool. When you figure that one out, I am certain you can calculate the number of gallons required. Des Perado We were told our 54"deep 24' round pool would hold 13,000 gallons of water. Ours was dug out to 6' in the center (approximately 1/2 the width of the pool) and took 15,736 gallons to fill. By the way, we used the garden hose which took 1 1/2 days (turned off while we slept) and cost about $70 on our water bill. Having water brought in was quoted at $200 for 7,000 gallons, which would have required 2 loads. Our municipality recommends if you fill your pools/spas with the garden hose, take a meter reading before beginning and at the end, then call them with the numbers. This way, if your water and sewer bills are combined, you don't get a humongous sewer bill. They only charge for the water usage. Good luck!