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 21 decimeters into kilometers we have to multiply 21 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

21 dm → L_(km)

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

L_(km) = 21 dm × 0.0001 km

L_(km) = 0.0021 km

The final result is:

21 dm → 0.0021 km

We conclude that 21 decimeters is equivalent to 0.0021 kilometers:

21 decimeters = 0.0021 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 476.19047619048 × 21 decimeters.

Another way is saying that 21 decimeters is equal to 1 ÷ 476.19047619048 kilometers.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one decimeters is approximately zero point zero zero two kilometers:

21 dm ≅ 0.002 km

An alternative is also that one kilometer is approximately four hundred seventy-six point one nine times twenty-one 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