Conversion formula

The conversion factor from millimeters to decimeters is 0.01, which means that 1 millimeter is equal to 0.01 decimeters:

1 mm = 0.01 dm

To convert 120 millimeters into decimeters we have to multiply 120 by the conversion factor in order to get the length amount from millimeters to decimeters. We can also form a simple proportion to calculate the result:

1 mm → 0.01 dm

120 mm → L_(dm)

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

L_(dm) = 120 mm × 0.01 dm

L_(dm) = 1.2 dm

The final result is:

120 mm → 1.2 dm

We conclude that 120 millimeters is equivalent to 1.2 decimeters:

120 millimeters = 1.2 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.83333333333333 × 120 millimeters.

Another way is saying that 120 millimeters is equal to 1 ÷ 0.83333333333333 decimeters.

Approximate result

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

120 mm ≅ 1.2 dm

An alternative is also that one decimeter is approximately zero point eight three three times one hundred twenty millimeters.

Conversion table

millimeters to decimeters chart

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