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www.reference.com/article/many-square-miles-earth-9a828fe84c9dab10

The Earth's total surface area is nearly 197 million square miles. Approximately 71 percent of the Earth's surface area is covered in water, and the remaining 29 percent is land. The Earth's total land surface area is about 57 million square miles.

www.reference.com/article/many-square-feet-mile-8a8c4c4daa5f8fd4

A square foot is a measure of surface area, and a mile is a measure of length. There are 5,280 feet in a mile and 27,878,400 square feet in a square mile.

www.reference.com/article/calculate-square-miles-9a15f533cae1381b

To calculate the area of a structure or section of land mass in square miles, use the formula for area of the section's shape with the dimensions, such as length, width, and radius, in miles. Not all sections of land or buildings have a simple shape, in which case the s...

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The area of a square or rectangle is equal to its width times its height. The sides of a perfect square are all equal, so the formula for a square is also area = x (squared), where "x" is the length of one side.

www.reference.com/article/many-acres-square-mile-da5dea82c6588fe

One square mile equals 640 survey acres. A survey acre is a U.S. customary unit of area derived from the Imperial system of measurement and is used primarily in the United States.