Conversion formula

The conversion factor from kilometers to decimeters is 10000, which means that 1 kilometer is equal to 10000 decimeters:

1 km = 10000 dm

To convert 21 kilometers into decimeters we have to multiply 21 by the conversion factor in order to get the length amount from kilometers to decimeters. We can also form a simple proportion to calculate the result:

1 km → 10000 dm

21 km → L(dm)

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

L(dm) = 21 km × 10000 dm

L(dm) = 210000 dm

The final result is:

21 km → 210000 dm

We conclude that 21 kilometers is equivalent to 210000 decimeters:

21 kilometers = 210000 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 4.7619047619048E-6 × 21 kilometers.

Another way is saying that 21 kilometers is equal to 1 ÷ 4.7619047619048E-6 decimeters.

Approximate result

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

21 km ≅ 210000 dm

An alternative is also that one decimeter is approximately zero times twenty-one kilometers.

Conversion table

kilometers to decimeters chart

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

kilometers (km) decimeters (dm)
22 kilometers 220000 decimeters
23 kilometers 230000 decimeters
24 kilometers 240000 decimeters
25 kilometers 250000 decimeters
26 kilometers 260000 decimeters
27 kilometers 270000 decimeters
28 kilometers 280000 decimeters
29 kilometers 290000 decimeters
30 kilometers 300000 decimeters
31 kilometers 310000 decimeters