To discover the number of gallons of water in an 850 square foot pool, we'll need to know the depth of the pool.
For a pool with 850 square feet and a known depth in feet, we'll find the volume by multiplying 850 ft2 by the depth in feet. With the answer in hand (and it will be in ft3 because we'll have a volume of water), we can find the number of gallons. There are about 7.48 gallons of water in a cubic foot. By multiplying our volume in ft3 by 7.48 (which is the conversion factor), we'll have discovered the volume of the pool in gallons.
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One cubic foot of water is 7.4805 gallons.
A gallon is a measure of volume whereas a square foot is a measure of area. So there are no gallons in a square foot and no square feet in a gallon.
1 gallon
There are 7.48052 US gallons per cubic foot.
1 cubic foot of water is 7.48052 US gallons.