# Convert Square Millimeters to Square Kilometers

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

**Results in Square Kilometers:**

## How to Convert Square Millimeters to Square Kilometers

To convert a square millimeter measurement to a square kilometer measurement, multiply the area by the conversion ratio. One square millimeter is equal to 1.0E-12 square kilometers, so use this simple formula to convert:

The area in square kilometers is equal to the square millimeters multiplied by 1.0E-12.

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

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

## Square Millimeters

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

The square millimeter, or square millimetre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "milli" is the prefix for 10^{-3}. A square millimeter is sometimes also referred to as a square mm. Square millimeters can be abbreviated as *sq mm*, and are also sometimes abbreviated as *mm²*. For example, 1 square millimeter can be written as 1 sq mm or 1 mm².

## 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 Millimeter Measurements and Equivalent Square Kilometer Conversions

Square Millimeters | Square Kilometers |
---|---|

1 sq mm | 0.000000000001 sq km |

2 sq mm | 0.000000000002 sq km |

3 sq mm | 0.000000000003 sq km |

4 sq mm | 0.000000000004 sq km |

5 sq mm | 0.000000000005 sq km |

6 sq mm | 0.000000000006 sq km |

7 sq mm | 0.000000000007 sq km |

8 sq mm | 0.000000000008 sq km |

9 sq mm | 0.000000000009 sq km |

10 sq mm | 0.00000000001 sq km |

11 sq mm | 0.000000000011 sq km |

12 sq mm | 0.000000000012 sq km |

13 sq mm | 0.000000000013 sq km |

14 sq mm | 0.000000000014 sq km |

15 sq mm | 0.000000000015 sq km |

16 sq mm | 0.000000000016 sq km |

17 sq mm | 0.000000000017 sq km |

18 sq mm | 0.000000000018 sq km |

19 sq mm | 0.000000000019 sq km |

20 sq mm | 0.00000000002 sq km |

21 sq mm | 0.000000000021 sq km |

22 sq mm | 0.000000000022 sq km |

23 sq mm | 0.000000000023 sq km |

24 sq mm | 0.000000000024 sq km |

25 sq mm | 0.000000000025 sq km |

26 sq mm | 0.000000000026 sq km |

27 sq mm | 0.000000000027 sq km |

28 sq mm | 0.000000000028 sq km |

29 sq mm | 0.000000000029 sq km |

30 sq mm | 0.00000000003 sq km |

31 sq mm | 0.000000000031 sq km |

32 sq mm | 0.000000000032 sq km |

33 sq mm | 0.000000000033 sq km |

34 sq mm | 0.000000000034 sq km |

35 sq mm | 0.000000000035 sq km |

36 sq mm | 0.000000000036 sq km |

37 sq mm | 0.000000000037 sq km |

38 sq mm | 0.000000000038 sq km |

39 sq mm | 0.000000000039 sq km |

40 sq mm | 0.00000000004 sq km |

## More Square Millimeter Area Conversions

**US Customary**

- Convert to Square Miles
- 1 sq mm is equal to 3.861E-13 square miles
- Convert to Acres
- 1 sq mm is equal to 2.4711E-10 acres
- Convert to Square Yards
- 1 sq mm is equal to 1.196E-6 square yards
- Convert to Square Feet
- 1 sq mm is equal to 1.0764E-5 square feet
- Convert to Square Inches
- 1 sq mm is equal to 0.00155 square inches

**SI Units**

- Convert to Square Meters
- 1 sq mm is equal to 1.0E-6 square meters
- Convert to Square Centimeters
- 1 sq mm is equal to 0.01 square centimeters

**Other Metric Units**

- Convert to Hectares
- 1 sq mm is equal to 1.0E-10 hectares
- Convert to Ares
- 1 sq mm is equal to 1.0E-8 ares