# Convert Acres to Square Kilometers

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

**Results in Square Kilometers:**

## How to Convert Acres to Square Kilometers

To convert an acre measurement to a square kilometer measurement, multiply the area by the conversion ratio. One acre is equal to 0.004047 square kilometers, so use this simple formula to convert:

The area in square kilometers is equal to the acres multiplied by 0.004047.

**For example,**here's how to convert 500 acres to square kilometers using the formula above.

Acres and square kilometers are both units used to measure area. Keep reading to learn more about each unit of measure.

## 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 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.

## Acre to Square Kilometer Conversion Table

Acres | Square Kilometers |
---|---|

1 ac | 0.004047 sq km |

2 ac | 0.008094 sq km |

3 ac | 0.012141 sq km |

4 ac | 0.016187 sq km |

5 ac | 0.020234 sq km |

6 ac | 0.024281 sq km |

7 ac | 0.028328 sq km |

8 ac | 0.032375 sq km |

9 ac | 0.036422 sq km |

10 ac | 0.040469 sq km |

20 ac | 0.080937 sq km |

30 ac | 0.121406 sq km |

40 ac | 0.161874 sq km |

50 ac | 0.202343 sq km |

60 ac | 0.242811 sq km |

70 ac | 0.28328 sq km |

80 ac | 0.323749 sq km |

90 ac | 0.364217 sq km |

100 ac | 0.404686 sq km |

200 ac | 0.809371 sq km |

300 ac | 1.2141 sq km |

400 ac | 1.6187 sq km |

500 ac | 2.0234 sq km |

600 ac | 2.4281 sq km |

700 ac | 2.8328 sq km |

800 ac | 3.2375 sq km |

900 ac | 3.6422 sq km |

1,000 ac | 4.0469 sq km |

## References

- National Institute of Standards and Technology, Handbook 44 - 2014 Edition, https://www.nist.gov/sites/default/files/documents/2017/05/09/appc-14-hb44-final.pdf