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 40 decimeters into kilometers we have to multiply 40 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

40 dm → L_(km)

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

L_(km) = 40 dm × 0.0001 km

L_(km) = 0.004 km

The final result is:

40 dm → 0.004 km

We conclude that 40 decimeters is equivalent to 0.004 kilometers:

40 decimeters = 0.004 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 250 × 40 decimeters.

Another way is saying that 40 decimeters is equal to 1 ÷ 250 kilometers.

Approximate result

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

40 dm ≅ 0.004 km

An alternative is also that one kilometer is approximately two hundred fifty times 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