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How many square miles in 1 acre?
The answer is 0.0015625.

We assume you are converting between **square mile** and **acre**.

You can view more details on each measurement unit:

square miles or
acre

The SI derived unit for **area** is the square meter.

1 square meter is equal to 3.86102158542E-7 square miles, or 0.000247105381467 acre.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between square miles and acres.

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You can do the reverse unit conversion from acre to square miles, or enter any two units below:

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A square mile is defined as the area of a square with sides one mile in length.

The definition of a mile is as follows:

A mile is any of several units of distance, or, in physics terminology, of length. Today, one mile is mainly equal to about 1609 m on land and 1852 m at sea and in the air, but see below for the details. The abbreviation for mile is 'mi'. There are more specific definitions of 'mile' such as the metric mile, statute mile, nautical mile, and survey mile. On this site, we assume that if you only specify 'mile' you want the statute mile.

An acre is a measure of land area in Imperial units or U.S. customary units. It is equal to 43 560 square feet, 4840 square yards, or 160 square rods. The precise meaning of this depends on the exact definition adopted for a foot: the international acre is 4 046.856 422 4 mē (for the UK, see). For measurements based specifically on the US survey foot the US survey acre is ca. 4 046.872 610 mē.

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