# Convert Square Kilometers to Square Millimeters

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

**Results in Square Millimeters:**

## How to Convert Square Kilometers to Square Millimeters

To convert a square kilometer measurement to a square millimeter measurement, multiply the area by the conversion ratio. One square kilometer is equal to 1,000,000,000,000 square millimeters, so use this simple formula to convert:

The area in square millimeters is equal to the square kilometers multiplied by 1,000,000,000,000.

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

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

## 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 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 Kilometer Measurements and Equivalent Square Millimeter Conversions

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

1 sq km | 1,000,000,000,000 sq mm |

2 sq km | 2,000,000,000,000 sq mm |

3 sq km | 3,000,000,000,000 sq mm |

4 sq km | 4,000,000,000,000 sq mm |

5 sq km | 5,000,000,000,000 sq mm |

6 sq km | 6,000,000,000,000 sq mm |

7 sq km | 7,000,000,000,000 sq mm |

8 sq km | 8,000,000,000,000 sq mm |

9 sq km | 9,000,000,000,000 sq mm |

10 sq km | 10,000,000,000,000 sq mm |

11 sq km | 11,000,000,000,000 sq mm |

12 sq km | 12,000,000,000,000 sq mm |

13 sq km | 13,000,000,000,000 sq mm |

14 sq km | 14,000,000,000,000 sq mm |

15 sq km | 15,000,000,000,000 sq mm |

16 sq km | 16,000,000,000,000 sq mm |

17 sq km | 17,000,000,000,000 sq mm |

18 sq km | 18,000,000,000,000 sq mm |

19 sq km | 19,000,000,000,000 sq mm |

20 sq km | 20,000,000,000,000 sq mm |

21 sq km | 21,000,000,000,000 sq mm |

22 sq km | 22,000,000,000,000 sq mm |

23 sq km | 23,000,000,000,000 sq mm |

24 sq km | 24,000,000,000,000 sq mm |

25 sq km | 25,000,000,000,000 sq mm |

26 sq km | 26,000,000,000,000 sq mm |

27 sq km | 27,000,000,000,000 sq mm |

28 sq km | 28,000,000,000,000 sq mm |

29 sq km | 29,000,000,000,000 sq mm |

30 sq km | 30,000,000,000,000 sq mm |

31 sq km | 31,000,000,000,000 sq mm |

32 sq km | 32,000,000,000,000 sq mm |

33 sq km | 33,000,000,000,000 sq mm |

34 sq km | 34,000,000,000,000 sq mm |

35 sq km | 35,000,000,000,000 sq mm |

36 sq km | 36,000,000,000,000 sq mm |

37 sq km | 37,000,000,000,000 sq mm |

38 sq km | 38,000,000,000,000 sq mm |

39 sq km | 39,000,000,000,000 sq mm |

40 sq km | 40,000,000,000,000 sq mm |

## More Square Kilometer Area Conversions

**US Customary**

- Convert to Square Miles
- 1 sq km is equal to 0.386102 square miles
- Convert to Acres
- 1 sq km is equal to 247.105381 acres
- Convert to Square Yards
- 1 sq km is equal to 1,195,990 square yards
- Convert to Square Feet
- 1 sq km is equal to 10,763,910.4 square feet
- Convert to Square Inches
- 1 sq km is equal to 1,550,003,100 square inches

**SI Units**

- Convert to Square Meters
- 1 sq km is equal to 1,000,000 square meters
- Convert to Square Centimeters
- 1 sq km is equal to 10,000,000,000 square centimeters

**Other Metric Units**

- Convert to Hectares
- 1 sq km is equal to 100 hectares
- Convert to Ares
- 1 sq km is equal to 10,000 ares