Conversion formula

The conversion factor from decimeters to millimeters is 100, which means that 1 decimeter is equal to 100 millimeters:

1 dm = 100 mm

To convert 100 decimeters into millimeters we have to multiply 100 by the conversion factor in order to get the length amount from decimeters to millimeters. We can also form a simple proportion to calculate the result:

1 dm → 100 mm

100 dm → L_(mm)

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

L_(mm) = 100 dm × 100 mm

L_(mm) = 10000 mm

The final result is:

100 dm → 10000 mm

We conclude that 100 decimeters is equivalent to 10000 millimeters:

100 decimeters = 10000 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.0001 × 100 decimeters.

Another way is saying that 100 decimeters is equal to 1 ÷ 0.0001 millimeters.

Approximate result

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

100 dm ≅ 10000 mm

An alternative is also that one millimeter is approximately zero times one hundred decimeters.

Conversion table

decimeters to millimeters chart

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