# Square Miles to Acres Conversion

Enter the area in square miles below to get the value converted to acres.

**Results in Acres:**

## How to Convert Square Miles to Acres

To convert a square mile measurement to an acre measurement, multiply the area by the conversion ratio.

Since one square mile is equal to 640 acres, you can use this simple formula to convert:

The area in acres is equal to the square miles multiplied by 640.

**For example,**here's how to convert 5 square miles to acres using the formula above.

### How Many Acres are in a Square Mile?

There are **640** acres in a square mile, which is why we use this value in the formula above.

1 sq mi = 640 ac

Square miles and acres are both units used to measure area. Keep reading to learn more about each unit of measure.

## Square Miles

One square mile is equal to the area of a square with sides that are 1 mile long. One square mile is roughly equal to 2.59 square kilometers.

The square mile is a US customary and imperial unit of area. Square miles can be abbreviated as *sq mi*, and are also sometimes abbreviated as *mi²*. For example, 1 square mile can be written as 1 sq mi or 1 mi².

## Acres

One acre is defined as the area equal to a space that is one chain (66 ft) by one furlong (660 ft), or 10 square chains.^{[1]} That's equal to 43,560 square feet for those unfamiliar with those units of measure.

The acre is a US customary and imperial unit of area. Acres can be abbreviated as *ac*; for example, 1 acre can be written as 1 ac.

Try our acreage calculator to find the area of a plot of land in acres by locating the boundaries on a map.

## Square Mile to Acre Conversion Table

Square Miles | Acres |
---|---|

1 sq mi | 640 ac |

2 sq mi | 1,280 ac |

3 sq mi | 1,920 ac |

4 sq mi | 2,560 ac |

5 sq mi | 3,200 ac |

6 sq mi | 3,840 ac |

7 sq mi | 4,480 ac |

8 sq mi | 5,120 ac |

9 sq mi | 5,760 ac |

10 sq mi | 6,400 ac |

11 sq mi | 7,040 ac |

12 sq mi | 7,680 ac |

13 sq mi | 8,320 ac |

14 sq mi | 8,960 ac |

15 sq mi | 9,600 ac |

16 sq mi | 10,240 ac |

17 sq mi | 10,880 ac |

18 sq mi | 11,520 ac |

19 sq mi | 12,160 ac |

20 sq mi | 12,800 ac |

21 sq mi | 13,440 ac |

22 sq mi | 14,080 ac |

23 sq mi | 14,720 ac |

24 sq mi | 15,360 ac |

25 sq mi | 16,000 ac |

26 sq mi | 16,640 ac |

27 sq mi | 17,280 ac |

28 sq mi | 17,920 ac |

29 sq mi | 18,560 ac |

30 sq mi | 19,200 ac |

31 sq mi | 19,840 ac |

32 sq mi | 20,480 ac |

33 sq mi | 21,120 ac |

34 sq mi | 21,760 ac |

35 sq mi | 22,400 ac |

36 sq mi | 23,040 ac |

37 sq mi | 23,680 ac |

38 sq mi | 24,320 ac |

39 sq mi | 24,960 ac |

40 sq mi | 25,600 ac |

## References

- National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf