## Unit Converter

## Conversion formula

The conversion factor from centimeters to kilometers is 1.0E-5, which means that 1 centimeter is equal to 1.0E-5 kilometers:

1 cm = 1.0E-5 km

To convert 639 centimeters into kilometers we have to multiply 639 by the conversion factor in order to get the length amount from centimeters to kilometers. We can also form a simple proportion to calculate the result:

1 cm → 1.0E-5 km

639 cm → L_{(km)}

Solve the above proportion to obtain the length *L* in kilometers:

L_{(km)} = 639 cm × 1.0E-5 km

L_{(km)} = 0.00639 km

The final result is:

639 cm → 0.00639 km

We conclude that **639 centimeters is equivalent to 0.00639 kilometers**:

639 centimeters = 0.00639 kilometers

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case **1 kilometer is equal to 156.49452269171 × 639 centimeters**.

Another way is saying that *639 centimeters is equal to 1 ÷ 156.49452269171 kilometers*.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that **six hundred thirty-nine centimeters is approximately zero point zero zero six kilometers**:

639 cm ≅ 0.006 km

An alternative is also that *one kilometer is approximately one hundred fifty-six point four nine five times six hundred thirty-nine centimeters*.

## Conversion table

### centimeters to kilometers chart

For quick reference purposes, below is the conversion table you can use to convert from centimeters to kilometers

centimeters (cm) | kilometers (km) |
---|---|

640 centimeters | 0.006 kilometers |

641 centimeters | 0.006 kilometers |

642 centimeters | 0.006 kilometers |

643 centimeters | 0.006 kilometers |

644 centimeters | 0.006 kilometers |

645 centimeters | 0.006 kilometers |

646 centimeters | 0.006 kilometers |

647 centimeters | 0.006 kilometers |

648 centimeters | 0.006 kilometers |

649 centimeters | 0.006 kilometers |