### What is an Acre?

Ahead of explaining how to convert square miles to acres, let us first define what a mile and an acre is. The acre(ac) is the most commonly used unit for the measurement of large land areas and is used in both the imperial and US customary systems.

There is no standard measurement of an acre, and it does not denote the same area in countries where it is used. While an acre of land in Scotland is equivalent to 1.27 standard acres, the Irish acre is equal to 1.6 British or US acres.

### What is a Square Mile?

While a square mile(sq.mi) is a unit of area measurement equal to a square measuring one mile on each side. Square mile is also a standard unit to calculate population numbers in a specific area. So the population numbers are often described in per square mile terms.

### Formula to Convert Acres to Square Miles.

To convert acres to sq. mi, we need to know the conversion ratio which we get from how they relate to each other.

We are told that 1 sq. mi is equal to 640 acres. Therefore, to convert acres to sq. mi, we divide the acres value by 640. Also we can use the vice versa of this where we say that 1 acre is equal to 0.001563 square miles.

**Area in sq. mi = Area in Acres ****÷**** 640**

**Area in sq.mi = Area in Acres x 0.001563**

**Example1:**

Convert 500 acres to square miles.

**= 500** **÷**** 640**

**= 0.78 square miles.**

**Example 2:**

Calculate the area of a piece of land in square miles if given 9,600 as its ares in acres.

We will convert the area from acres to sq.mi by multiplying it by 0.001563.

**= 9,600 x 0.001563**

**Therefore, the area **in sq.mi is 15.

### Acres to Square Miles Conversion Table.

Acres(ac) | Square Miles(sq.mi) |

1 | 0.001563 |

2 | 0.003125 |

3 | 0.004688 |

4 | 0.00625 |

5 | 0.007813 |

6 | 0.009375 |

7 | 0.010938 |

8 | 0.0125 |

9 | 0.014063 |

10 | 0.015625 |

20 | 0.03125 |

30 | 0.046875 |

40 | 0.0625 |

50 | 0.078125 |

60 | 0.09375 |

70 | 0.109375 |

80 | 0.125 |

90 | 0.140625 |

100 | 0.15625 |

1000 | 1.5625 |