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 138 decimeters into millimeters we have to multiply 138 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

138 dm → L_(mm)

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

L_(mm) = 138 dm × 100 mm

L_(mm) = 13800 mm

The final result is:

138 dm → 13800 mm

We conclude that 138 decimeters is equivalent to 13800 millimeters:

138 decimeters = 13800 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 7.2463768115942E-5 × 138 decimeters.

Another way is saying that 138 decimeters is equal to 1 ÷ 7.2463768115942E-5 millimeters.

Approximate result

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

138 dm ≅ 13800 mm

An alternative is also that one millimeter is approximately zero times one hundred thirty-eight 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