How many gallons to fill a 21 ft round pool that is 6 ft in the middle?

Answer 1

The volume depends on the height. A one-foot deep pool six-feet in diameter would hold about 176 Imperial gallons (211 US gallons). Every extra foot high would hold the same amount again A pool two foot six inches deep would therefore hold 176 * 2.5 = 440 Imperial gallons or 211 * 2.5 = 528 US gallons.

Answer 2

Measure the diameter and depth of the pool, in feet.

Gallons = 5.8752 x (diameter x diameter x depth).

That will work if the bottom of the pool is flat. If the bottom slopes,

then it's going to be a lot more complicated.

Answer 3

This would be about 15,611 gallons of water.