How much water does a 21' round pool hold if it is 52' deep?

Answer 1

Here's a formula for round pools:

distance across*distance across*depth*5.9

for rectangles:

length*width*depth*7.5

or for a deep end:

length*width*((shallow end depth + deep end depth)/2)*7.5

so in your case, 21*21*4.3*5.9=11000 gallons

Answer 2

5000