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First, you multiply 20 times pi which gives you 62.8318. This is the square feet of surface area. Multiply this by 4 and you get 251.3272. This is the cubic feet. There are 7.48 gallons in each cubic foot so multiply 251.3272 by 7.48 and you get 1879.927 gallons.

Q: How many gallons of water to fill a pool 20 foot by 4 foot?

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The pool holds 7,600 gallons of water

598 Imperial gallons, approx.

If you fill it with 4 feet of water (48 inches), the pool will contain about 5,310 gallons of water.

89.8 gallons for every foot of depth.

Exactly 5264.1669 gallons

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The pool holds 7,600 gallons of water

598 Imperial gallons, approx.

If you fill it with 4 feet of water (48 inches), the pool will contain about 5,310 gallons of water.

That's 27 cf of water. And, at 7.48 gal/cf, that gives you... 201.96 gallons, or 202 gallons rounded...

If the bottom is flat and level, then it takes 239.38 gallons for each inch of the water's depth.

89.8 gallons for every foot of depth.

Exactly 5264.1669 gallons

Twelve feet of water in a 10-foot round pool is approximately 7,080 gallons.

22.5 cubic feet = 168.3 gallons US (rounded) 140.15 Imperial gallons

7,646 gallons.

An 18-foot round pool with 3 feet of water contains 5,734.8 gallons of water. If you fill it to 4 feet deep it increases to 7,646 gallons of water.

One cubic foot of water is 7.4805 gallons.