A round swimming pool is a right circular cylinder, so you can use the formula pi times the radius squared times the height to calculate the volume.
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There is NO way to calculate this without knowing how deep the pool is filled!
A 20 foot round pool has a radius of 3.2 feet. So the pool has a volume of pi*r2*h = 101.86 cubic ft approx.
Here's a good resource and the formula necessary to calculate water volume in a swimming poo... http://www.backyardcitypools.com/swimming-pools/Pool-Volume-Calculate.htm (may need to copy/paste link) Hope this helps.. Terry Duff
length(M) x width(M) x average depth(M) you will get pool volume in cubic meter. convert it in to gallons or any other unit
The circumference is 50.24 meters.