# Square Kilometers to Square Millimeters Conversion

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

**Results in Square Millimeters:**

1 sq km = 10,000,000,000 sq cm

1 sq km = 1,000,000 sq m

## 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.

Since one square kilometer is equal to 1,000,000,000,000 square millimeters, you can 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.

### How Many Square Millimeters are in a Square Kilometer?

There are **1,000,000,000,000** square millimeters in a square kilometer, which is why we use this value in the formula above.

1 sq km = 1,000,000,000,000 sq mm

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 to Square Millimeter Conversion Table

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

0.000000000001 sq km | 1 sq mm |

0.000000000002 sq km | 2 sq mm |

0.000000000003 sq km | 3 sq mm |

0.000000000004 sq km | 4 sq mm |

0.000000000005 sq km | 5 sq mm |

0.000000000006 sq km | 6 sq mm |

0.000000000007 sq km | 7 sq mm |

0.000000000008 sq km | 8 sq mm |

0.000000000009 sq km | 9 sq mm |

0.0000000000001 sq km | 0.1 sq mm |

0.000000000001 sq km | 1 sq mm |

0.00000000001 sq km | 10 sq mm |

0.0000000001 sq km | 100 sq mm |

0.000000001 sq km | 1,000 sq mm |

0.00000001 sq km | 10,000 sq mm |

0.0000001 sq km | 100,000 sq mm |

0.000001 sq km | 1,000,000 sq mm |

0.00001 sq km | 10,000,000 sq mm |

0.0001 sq km | 100,000,000 sq mm |

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

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

0.1 sq km | 100,000,000,000 sq mm |

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