Gallons is a measure of volume. Square feet is a measure of area. It's sort of like asking how many diet cokes are in a sheet of paper.
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Just divide the number of gallons by the number of square feet.
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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.
40 square feet * 2 inches = 40*(1/6) = 6.66... cubic ft = 41.5 UK gallons or 49.9 US gallons (approx).
There are zero gallons in any number of square feet, as square feet have no distance in the tird dimension to qualify a volume.