## 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