# Kilometers Conversion

The kilometer is a unit used to measure length. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about kilometers.

## Kilometer Conversion Calculators

Choose a unit of length to convert to.

**US Customary & Imperial Units**

- Convert kilometers to miles
- 1 kilometer is equal to 0.621371 miles
- Convert kilometers to yards
- 1 kilometer is equal to 1,094 yards
- Convert kilometers to feet
- 1 kilometer is equal to 3,281 feet
- Convert kilometers to inches
- 1 kilometer is equal to 39,370 inches

**SI Units**

- Convert kilometers to meters
- 1 kilometer is equal to 1,000 meters
- Convert kilometers to centimeters
- 1 kilometer is equal to 100,000 centimeters
- Convert kilometers to millimeters
- 1 kilometer is equal to 1,000,000 millimeters
- Convert kilometers to micrometers
- 1 kilometer is equal to 1,000,000,000 micrometers
- Convert kilometers to nanometers
- 1 kilometer is equal to 1,000,000,000,000 nanometers

## Kilometer Definition and Usage

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.^{[1]}

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.

### Uses

The kilometer is officially used for expressing distance between geographical places around the world, with the exception of the United States, which uses the mile. In the US, it is actually prohibited to use federal highway funding to purchase road signs using kilometers or other metric units.

## Kilometers Measurement Conversion Table

kilometers | miles | yards | feet | inches | meters | centimeters | millimeters | micrometers | nanometers |
---|---|---|---|---|---|---|---|---|---|

1 km | 0.621371 mi | 1,094 yd | 3,281' | 39,370" | 1,000 m | 100,000 cm | 1,000,000 mm | 1,000,000,000 µm | 1,000,000,000,000 nm |

2 km | 1.242742 mi | 2,187 yd | 6,562' | 78,740" | 2,000 m | 200,000 cm | 2,000,000 mm | 2,000,000,000 µm | 2,000,000,000,000 nm |

3 km | 1.864114 mi | 3,281 yd | 9,843' | 118,110" | 3,000 m | 300,000 cm | 3,000,000 mm | 3,000,000,000 µm | 3,000,000,000,000 nm |

4 km | 2.485485 mi | 4,374 yd | 13,123' | 157,480" | 4,000 m | 400,000 cm | 4,000,000 mm | 4,000,000,000 µm | 4,000,000,000,000 nm |

5 km | 3.106856 mi | 5,468 yd | 16,404' | 196,850" | 5,000 m | 500,000 cm | 5,000,000 mm | 5,000,000,000 µm | 5,000,000,000,000 nm |

6 km | 3.728227 mi | 6,562 yd | 19,685' | 236,220" | 6,000 m | 600,000 cm | 6,000,000 mm | 6,000,000,000 µm | 6,000,000,000,000 nm |

7 km | 4.349598 mi | 7,655 yd | 22,966' | 275,591" | 7,000 m | 700,000 cm | 7,000,000 mm | 7,000,000,000 µm | 7,000,000,000,000 nm |

8 km | 4.97097 mi | 8,749 yd | 26,247' | 314,961" | 8,000 m | 800,000 cm | 8,000,000 mm | 8,000,000,000 µm | 8,000,000,000,000 nm |

9 km | 5.592341 mi | 9,843 yd | 29,528' | 354,331" | 9,000 m | 900,000 cm | 9,000,000 mm | 9,000,000,000 µm | 9,000,000,000,000 nm |

10 km | 6.213712 mi | 10,936 yd | 32,808' | 393,701" | 10,000 m | 1,000,000 cm | 10,000,000 mm | 10,000,000,000 µm | 10,000,000,000,000 nm |

11 km | 6.835083 mi | 12,030 yd | 36,089' | 433,071" | 11,000 m | 1,100,000 cm | 11,000,000 mm | 11,000,000,000 µm | 11,000,000,000,000 nm |

12 km | 7.456454 mi | 13,123 yd | 39,370' | 472,441" | 12,000 m | 1,200,000 cm | 12,000,000 mm | 12,000,000,000 µm | 12,000,000,000,000 nm |

13 km | 8.077825 mi | 14,217 yd | 42,651' | 511,811" | 13,000 m | 1,300,000 cm | 13,000,000 mm | 13,000,000,000 µm | 13,000,000,000,000 nm |

14 km | 8.699197 mi | 15,311 yd | 45,932' | 551,181" | 14,000 m | 1,400,000 cm | 14,000,000 mm | 14,000,000,000 µm | 14,000,000,000,000 nm |

15 km | 9.320568 mi | 16,404 yd | 49,213' | 590,551" | 15,000 m | 1,500,000 cm | 15,000,000 mm | 15,000,000,000 µm | 15,000,000,000,000 nm |

16 km | 9.941939 mi | 17,498 yd | 52,493' | 629,921" | 16,000 m | 1,600,000 cm | 16,000,000 mm | 16,000,000,000 µm | 16,000,000,000,000 nm |

17 km | 10.56331 mi | 18,591 yd | 55,774' | 669,291" | 17,000 m | 1,700,000 cm | 17,000,000 mm | 17,000,000,000 µm | 17,000,000,000,000 nm |

18 km | 11.184681 mi | 19,685 yd | 59,055' | 708,661" | 18,000 m | 1,800,000 cm | 18,000,000 mm | 18,000,000,000 µm | 18,000,000,000,000 nm |

19 km | 11.806053 mi | 20,779 yd | 62,336' | 748,031" | 19,000 m | 1,900,000 cm | 19,000,000 mm | 19,000,000,000 µm | 19,000,000,000,000 nm |

20 km | 12.427424 mi | 21,872 yd | 65,617' | 787,402" | 20,000 m | 2,000,000 cm | 20,000,000 mm | 20,000,000,000 µm | 20,000,000,000,000 nm |

## References

- Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI),
*National Institute of Standards and Technology*, https://physics.nist.gov/cuu/pdf/sp811.pdf

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