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 640 centimeters into kilometers we have to multiply 640 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

640 cm → L_(km)

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

L_(km) = 640 cm × 1.0E-5 km

L_(km) = 0.0064 km

The final result is:

640 cm → 0.0064 km

We conclude that 640 centimeters is equivalent to 0.0064 kilometers:

640 centimeters = 0.0064 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 156.25 × 640 centimeters.

Another way is saying that 640 centimeters is equal to 1 ÷ 156.25 kilometers.

Approximate result

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

640 cm ≅ 0.006 km

An alternative is also that one kilometer is approximately one hundred fifty-six point two five times six hundred forty 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