# Convert Square Miles to Square Kilometers

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

**Results in Square Kilometers:**

## How to Convert Square Miles to Square Kilometers

To convert a square mile measurement to a square kilometer measurement, multiply the area by the conversion ratio. One square mile is equal to 2.589988 square kilometers, so use this simple formula to convert:

The area in square kilometers is equal to the square miles multiplied by 2.589988.

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

Square miles and square kilometers 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.

## Square Kilometers

One square kilometer is equal to the area of a square with sides that are 1 kilometer in length.

The square kilometer, or square kilometre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "kilo" is the prefix for 10^{3}. A square kilometer is sometimes also referred to as a square km. Square kilometers can be abbreviated as *sq km*, and are also sometimes abbreviated as *km²*. For example, 1 square kilometer can be written as 1 sq km or 1 km².

## Square Mile Measurements and Equivalent Square Kilometer Conversions

Square Miles | Square Kilometers |
---|---|

1 sq mi | 2.59 sq km |

2 sq mi | 5.18 sq km |

3 sq mi | 7.77 sq km |

4 sq mi | 10.36 sq km |

5 sq mi | 12.95 sq km |

6 sq mi | 15.54 sq km |

7 sq mi | 18.13 sq km |

8 sq mi | 20.72 sq km |

9 sq mi | 23.31 sq km |

10 sq mi | 25.9 sq km |

11 sq mi | 28.49 sq km |

12 sq mi | 31.08 sq km |

13 sq mi | 33.67 sq km |

14 sq mi | 36.26 sq km |

15 sq mi | 38.85 sq km |

16 sq mi | 41.44 sq km |

17 sq mi | 44.03 sq km |

18 sq mi | 46.62 sq km |

19 sq mi | 49.21 sq km |

20 sq mi | 51.8 sq km |

21 sq mi | 54.39 sq km |

22 sq mi | 56.98 sq km |

23 sq mi | 59.57 sq km |

24 sq mi | 62.16 sq km |

25 sq mi | 64.75 sq km |

26 sq mi | 67.34 sq km |

27 sq mi | 69.93 sq km |

28 sq mi | 72.52 sq km |

29 sq mi | 75.11 sq km |

30 sq mi | 77.7 sq km |

31 sq mi | 80.29 sq km |

32 sq mi | 82.88 sq km |

33 sq mi | 85.47 sq km |

34 sq mi | 88.06 sq km |

35 sq mi | 90.65 sq km |

36 sq mi | 93.24 sq km |

37 sq mi | 95.83 sq km |

38 sq mi | 98.42 sq km |

39 sq mi | 101.01 sq km |

40 sq mi | 103.6 sq km |

## More Square Mile Area Conversions

**US Customary**

- Convert to Acres
- 1 sq mi is equal to 640 acres
- Convert to Square Yards
- 1 sq mi is equal to 3,097,600 square yards
- Convert to Square Feet
- 1 sq mi is equal to 27,878,400 square feet
- Convert to Square Inches
- 1 sq mi is equal to 4,014,489,599.5 square inches

**SI Units**

- Convert to Square Meters
- 1 sq mi is equal to 2,589,988.1 square meters
- Convert to Square Centimeters
- 1 sq mi is equal to 25,899,881,100 square centimeters
- Convert to Square Millimeters
- 1 sq mi is equal to 2,589,988,110,000 square millimeters

**Other Metric Units**

- Convert to Hectares
- 1 sq mi is equal to 258.998811 hectares
- Convert to Ares
- 1 sq mi is equal to 25,899.9 ares