How Many Acres in a Square Mile?

An acre is a unit of land area commonly used in the United States, equivalent to 43,560 square feet, and a square mile is an imperial unit representing an area of 640 acres or 2.59 square kilometers. Let’s understand the relationship between Acres and Square Miles.

Answer: There are 640 acres in a square mile.

One acre is defined as 43,560 square feet. A square mile, as the name suggests, is the area of a square with each side measuring one mile in length. Since one mile is equal to 5,280 feet, a square mile is a square with each side of 5,280 feet.

The area of a square is calculated by squaring the length of its side, so the area of a square mile is:

5,280 feet × 5,280 feet = 27,878,400 square feet

To find out how many acres are in a square mile, we divide the total square feet in a square mile by the square feet in an acre:

27,878,400 square feet ÷ 43,560 square feet per acre=640 acres

Therefore, there are 640 acres in a square mile.