Depth x Diameter-squared x 5.9 = Volume in Gallons
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formula for determining how many gallons in a pool is, length times width times average depth times 7.5 = gallons of water in pool if it round or oval its times 5.9
Assuming your pool is round about 800 gallons.
4,500 gallons.
2,500 gallons.
It should take around 30,457 gallons to fill that pool. Using the Volume formula (pi * radius^2 * height), I determined that the pool was roughly 4071.5 cubic feet. I then used Google calculator to convert this to gallons.