Conversion formula

The conversion factor from decimeters to kilometers is 0.0001, which means that 1 decimeter is equal to 0.0001 kilometers:

1 dm = 0.0001 km

To convert 640 decimeters into kilometers we have to multiply 640 by the conversion factor in order to get the length amount from decimeters to kilometers. We can also form a simple proportion to calculate the result:

1 dm → 0.0001 km

640 dm → L_(km)

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

L_(km) = 640 dm × 0.0001 km

L_(km) = 0.064 km

The final result is:

640 dm → 0.064 km

We conclude that 640 decimeters is equivalent to 0.064 kilometers:

640 decimeters = 0.064 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 15.625 × 640 decimeters.

Another way is saying that 640 decimeters is equal to 1 ÷ 15.625 kilometers.

Approximate result

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

640 dm ≅ 0.064 km

An alternative is also that one kilometer is approximately fifteen point six two five times six hundred forty decimeters.

Conversion table

decimeters to kilometers chart

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