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Close to 24,000 gal if it is rectangular.

Q: How many gallons of water to fill a 20x40 3ft8ft in ground pool?

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10053.82 gallons (US) 8371.568 gallons (UK)

You can fill a standard in-ground swimming pool.

How large is the pool? In ground or above ground? Shape? Above ground is easier to calculate. I have an oval above ground pool which is 18 x 38. It holds approx. 15,000 gallons. To get an accurate answer, you need to be far more specific.

A typical in-ground home pool contains between 20,000 and 30,000 gallons of water.

...What are the dimensions of the pool?

18,506 U.S. gallons

6015.77 gallons

319.2 gallons for every inch the water in it is deep.

This cannot be answered without knowing the depth of the water.

A round pool that is 16 feet across and is filled with 48 inches of water will contain about 6,041 gallons of water.

Just a little over 6,000 gallons.

13,346 gallons per vertical foot.