You cannot convert a measure of area (square feet) to a measure of volume (gallons). Gallons is a measure of volume, or of 3 dimensions. You'd need cubic feet (not square feet) to convert it to gallons.
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.
To calculate the volume of water in a 150-acre lake that is 20 feet deep, first convert acres to square feet (1 acre = 43,560 square feet). Therefore, 150 acres is 6,534,000 square feet. The volume in cubic feet is then 6,534,000 square feet multiplied by 20 feet, equaling 130,680,000 cubic feet. Since there are approximately 7.48 gallons in a cubic foot, the total volume in gallons is about 975,840,000 gallons.
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.
To calculate the volume of water from 1 inch of rain on a 1,320 square foot roof, first convert 1 inch of rain to feet, which is 1/12 feet. The volume of water is then calculated as the area (in square feet) multiplied by the depth (in feet). Thus, 1,320 square feet multiplied by 1/12 feet equals 110 cubic feet. Since there are about 7.48 gallons in a cubic foot, you would multiply 110 by 7.48, resulting in approximately 822 gallons of water.
None ... gallons is a measurement of volume, square feet is area not volume.
One inch of water over one square foot of surface area is approximately 0.623 gallons. To calculate the total volume, you can multiply this value by the surface area in square feet. For example, if you have a larger area, simply multiply the number of square feet by 0.623 to find the total gallons for that depth of water.
There are 43,560 square feet in one acre. Water is often measured in gallons, and one cubic foot of water contains approximately 7.48 gallons. Therefore, one acre of water, to a depth of one foot, would contain about 325,851 gallons (43,560 square feet x 7.48 gallons per cubic foot).
The amount (volume) of water is measured in gallons or cubic feet.
100 gallons = 13.37 cubic feet.
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