# 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 a 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 5 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. 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 Measurements and Equivalent Square Kilometer Conversions

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 |

11 ac | 0.044515 sq km |

12 ac | 0.048562 sq km |

13 ac | 0.052609 sq km |

14 ac | 0.056656 sq km |

15 ac | 0.060703 sq km |

16 ac | 0.06475 sq km |

17 ac | 0.068797 sq km |

18 ac | 0.072843 sq km |

19 ac | 0.07689 sq km |

20 ac | 0.080937 sq km |

21 ac | 0.084984 sq km |

22 ac | 0.089031 sq km |

23 ac | 0.093078 sq km |

24 ac | 0.097125 sq km |

25 ac | 0.101171 sq km |

26 ac | 0.105218 sq km |

27 ac | 0.109265 sq km |

28 ac | 0.113312 sq km |

29 ac | 0.117359 sq km |

30 ac | 0.121406 sq km |

31 ac | 0.125453 sq km |

32 ac | 0.129499 sq km |

33 ac | 0.133546 sq km |

34 ac | 0.137593 sq km |

35 ac | 0.14164 sq km |

36 ac | 0.145687 sq km |

37 ac | 0.149734 sq km |

38 ac | 0.153781 sq km |

39 ac | 0.157827 sq km |

40 ac | 0.161874 sq km |

## More Acre Area Conversions

**US Customary**

- Convert to Square Miles
- 1 ac is equal to 0.001563 square miles
- Convert to Square Yards
- 1 ac is equal to 4,840 square yards
- Convert to Square Feet
- 1 ac is equal to 43,560 square feet
- Convert to Square Inches
- 1 ac is equal to 6,272,640 square inches

**SI Units**

- Convert to Square Meters
- 1 ac is equal to 4,046.86 square meters
- Convert to Square Centimeters
- 1 ac is equal to 40,468,564.2 square centimeters
- Convert to Square Millimeters
- 1 ac is equal to 4,046,856,422.4 square millimeters

**Other Metric Units**

- Convert to Hectares
- 1 ac is equal to 0.404686 hectares
- Convert to Ares
- 1 ac is equal to 40.468564 ares