There are no gallons of water in a square foot. Gallons is a unit of volume, and square feet is a unit of area, not volume. If you are asking about cubic feet, however, the answer is there are about 7.5 gallons in a cubic foot.
One acre of land is equivalent to 43,560 square feet. With 3 feet of water covering this area, you would have 130,680 cubic feet of water. One cubic foot is equal to 7.48 gallons, so 130,680 cubic feet of water would be about 977,370 gallons.
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.
Just divide the number of gallons by the number of square feet.
None ... gallons is a measurement of volume, square feet is area not volume.
The amount (volume) of water is measured in gallons or cubic feet.
350
There are 7.48 gallons in 1 cubic foot, so 100 gallons of water would equal approximately 13.36 cubic feet.
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 144 square feet in 2000 gallons, assuming you are asking about surface area coverage. This can vary based on how you are spreading the gallons (e.g., on soil, on a floor).
7.5