# Square Miles Conversion

The square mile is a unit used to measure area. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about square miles.

## Square Mile Conversion Calculators

Choose a unit of area to convert to.

**US Customary**

**SI Units**

**Other Metric Units**

## Square Mile Definition and Usage

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.

You might also be interested in our area calculator.

## Square Miles Measurement Conversion Table

square miles | acres | square yards | square feet | square inches | square kilometers | square meters | square centimeters | square millimeters | hectares | ares |
---|---|---|---|---|---|---|---|---|---|---|

1 sq mi | 640 ac | 3,097,600 sq yd | 27,878,400 sq ft | 4,014,489,599 sq in | 2.589988 sq km | 2,589,988 sq m | 25,899,881,100 sq cm | 2,589,988,110,000 sq mm | 258.998811 ha | 25,900 a |

2 sq mi | 1,280 ac | 6,195,200 sq yd | 55,756,800 sq ft | 8,028,979,199 sq in | 5.179976 sq km | 5,179,976 sq m | 51,799,762,200 sq cm | 5,179,976,220,000 sq mm | 517.997622 ha | 51,800 a |

3 sq mi | 1,920 ac | 9,292,800 sq yd | 83,635,200 sq ft | 12,043,468,798 sq in | 7.769964 sq km | 7,769,964 sq m | 77,699,643,300 sq cm | 7,769,964,330,000 sq mm | 776.996433 ha | 77,700 a |

4 sq mi | 2,560 ac | 12,390,400 sq yd | 111,513,600 sq ft | 16,057,958,398 sq in | 10.359952 sq km | 10,359,952 sq m | 103,599,524,400 sq cm | 10,359,952,440,000 sq mm | 1,036 ha | 103,600 a |

5 sq mi | 3,200 ac | 15,488,000 sq yd | 139,392,000 sq ft | 20,072,447,997 sq in | 12.949941 sq km | 12,949,941 sq m | 129,499,405,500 sq cm | 12,949,940,550,000 sq mm | 1,295 ha | 129,499 a |

6 sq mi | 3,840 ac | 18,585,600 sq yd | 167,270,400 sq ft | 24,086,937,597 sq in | 15.539929 sq km | 15,539,929 sq m | 155,399,286,600 sq cm | 15,539,928,660,000 sq mm | 1,554 ha | 155,399 a |

7 sq mi | 4,480 ac | 21,683,200 sq yd | 195,148,800 sq ft | 28,101,427,196 sq in | 18.129917 sq km | 18,129,917 sq m | 181,299,167,700 sq cm | 18,129,916,770,000 sq mm | 1,813 ha | 181,299 a |

8 sq mi | 5,120 ac | 24,780,800 sq yd | 223,027,200 sq ft | 32,115,916,796 sq in | 20.719905 sq km | 20,719,905 sq m | 207,199,048,800 sq cm | 20,719,904,880,000 sq mm | 2,072 ha | 207,199 a |

9 sq mi | 5,760 ac | 27,878,400 sq yd | 250,905,600 sq ft | 36,130,406,395 sq in | 23.309893 sq km | 23,309,893 sq m | 233,098,929,900 sq cm | 23,309,892,990,000 sq mm | 2,331 ha | 233,099 a |

10 sq mi | 6,400 ac | 30,976,000 sq yd | 278,784,000 sq ft | 40,144,895,995 sq in | 25.899881 sq km | 25,899,881 sq m | 258,998,811,000 sq cm | 25,899,881,100,000 sq mm | 2,590 ha | 258,999 a |

11 sq mi | 7,040 ac | 34,073,600 sq yd | 306,662,400 sq ft | 44,159,385,594 sq in | 28.489869 sq km | 28,489,869 sq m | 284,898,692,100 sq cm | 28,489,869,210,000 sq mm | 2,849 ha | 284,899 a |

12 sq mi | 7,680 ac | 37,171,200 sq yd | 334,540,800 sq ft | 48,173,875,194 sq in | 31.079857 sq km | 31,079,857 sq m | 310,798,573,200 sq cm | 31,079,857,320,000 sq mm | 3,108 ha | 310,799 a |

13 sq mi | 8,320 ac | 40,268,800 sq yd | 362,419,200 sq ft | 52,188,364,793 sq in | 33.669845 sq km | 33,669,845 sq m | 336,698,454,300 sq cm | 33,669,845,430,000 sq mm | 3,367 ha | 336,698 a |

14 sq mi | 8,960 ac | 43,366,400 sq yd | 390,297,600 sq ft | 56,202,854,393 sq in | 36.259834 sq km | 36,259,834 sq m | 362,598,335,400 sq cm | 36,259,833,540,000 sq mm | 3,626 ha | 362,598 a |

15 sq mi | 9,600 ac | 46,464,000 sq yd | 418,176,000 sq ft | 60,217,343,992 sq in | 38.849822 sq km | 38,849,822 sq m | 388,498,216,500 sq cm | 38,849,821,650,000 sq mm | 3,885 ha | 388,498 a |

16 sq mi | 10,240 ac | 49,561,600 sq yd | 446,054,400 sq ft | 64,231,833,592 sq in | 41.43981 sq km | 41,439,810 sq m | 414,398,097,600 sq cm | 41,439,809,760,000 sq mm | 4,144 ha | 414,398 a |

17 sq mi | 10,880 ac | 52,659,200 sq yd | 473,932,800 sq ft | 68,246,323,191 sq in | 44.029798 sq km | 44,029,798 sq m | 440,297,978,700 sq cm | 44,029,797,870,000 sq mm | 4,403 ha | 440,298 a |

18 sq mi | 11,520 ac | 55,756,800 sq yd | 501,811,200 sq ft | 72,260,812,791 sq in | 46.619786 sq km | 46,619,786 sq m | 466,197,859,800 sq cm | 46,619,785,980,000 sq mm | 4,662 ha | 466,198 a |

19 sq mi | 12,160 ac | 58,854,400 sq yd | 529,689,600 sq ft | 76,275,302,390 sq in | 49.209774 sq km | 49,209,774 sq m | 492,097,740,900 sq cm | 49,209,774,090,000 sq mm | 4,921 ha | 492,098 a |

20 sq mi | 12,800 ac | 61,952,000 sq yd | 557,568,000 sq ft | 80,289,791,990 sq in | 51.799762 sq km | 51,799,762 sq m | 517,997,622,000 sq cm | 51,799,762,200,000 sq mm | 5,180 ha | 517,998 a |

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