# Convert Kilometers to Millimeters

Enter the length in kilometers below to get the value converted to millimeters.

**Results in Millimeters:**

## How to Convert Kilometers to Millimeters

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

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

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

Our inch fraction calculator can add kilometers and millimeters together and it also automatically converts the results to US customary, imperial and SI metric values.

Kilometers and millimeters are both units used to measure length. Keep reading to learn more about each unit of measure.

## Kilometers

One kilometer is equal to 1,000 meters, which are defined as the distance light travels in a vacuum in a ^{1}/_{299,792,458} second time interval.

The kilometer, or kilometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "kilo" is the prefix for 10^{3}. Kilometers can be abbreviated as *km*, for example 1 kilometer can be written as 1 km.

## Millimeters

One millimeter is equal to one-thousandth (1/1,000) of a meter, which is defined as the distance light travels in a vacuum in a ^{1}/_{299,792,458} second time interval.

The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for 10^{-3}. Millimeters can be abbreviated as *mm*, for example 1 millimeter can be written as 1 mm.

Millimeters are often represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a US dime is 1.35mm.

We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs.

If you need a ruler you can also download and print our free printable rulers, which include both imperial and metric measurements.

## Kilometer Measurements and Equivalent Millimeter Conversions

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

1 km | 1,000,000 mm |

2 km | 2,000,000 mm |

3 km | 3,000,000 mm |

4 km | 4,000,000 mm |

5 km | 5,000,000 mm |

6 km | 6,000,000 mm |

7 km | 7,000,000 mm |

8 km | 8,000,000 mm |

9 km | 9,000,000 mm |

10 km | 10,000,000 mm |

11 km | 11,000,000 mm |

12 km | 12,000,000 mm |

13 km | 13,000,000 mm |

14 km | 14,000,000 mm |

15 km | 15,000,000 mm |

16 km | 16,000,000 mm |

17 km | 17,000,000 mm |

18 km | 18,000,000 mm |

19 km | 19,000,000 mm |

20 km | 20,000,000 mm |

21 km | 21,000,000 mm |

22 km | 22,000,000 mm |

23 km | 23,000,000 mm |

24 km | 24,000,000 mm |

25 km | 25,000,000 mm |

26 km | 26,000,000 mm |

27 km | 27,000,000 mm |

28 km | 28,000,000 mm |

29 km | 29,000,000 mm |

30 km | 30,000,000 mm |

31 km | 31,000,000 mm |

32 km | 32,000,000 mm |

33 km | 33,000,000 mm |

34 km | 34,000,000 mm |

35 km | 35,000,000 mm |

36 km | 36,000,000 mm |

37 km | 37,000,000 mm |

38 km | 38,000,000 mm |

39 km | 39,000,000 mm |

40 km | 40,000,000 mm |

## More Kilometer Length Conversions

**US Customary & Imperial Units**

- Convert to Miles
- 1 km is equal to 0.621371 miles
- Convert to Yards
- 1 km is equal to 1,093.61 yards
- Convert to Feet
- 1 km is equal to 3,280.84 feet
- Convert to Inches
- 1 km is equal to 39,370.1 inches

**SI Units**

- Convert to Meters
- 1 km is equal to 1,000 meters
- Convert to Centimeters
- 1 km is equal to 100,000 centimeters
- Convert to Micrometers
- 1 km is equal to 1,000,000,000 micrometers
- Convert to Nanometers
- 1 km is equal to 1,000,000,000,000 nanometers