## 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 0.5 decimeters into millimeters we have to multiply 0.5 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

0.5 dm → L(mm)

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

L(mm) = 0.5 dm × 100 mm

L(mm) = 50 mm

The final result is:

0.5 dm → 50 mm

We conclude that 0.5 decimeters is equivalent to 50 millimeters:

0.5 decimeters = 50 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.02 × 0.5 decimeters.

Another way is saying that 0.5 decimeters is equal to 1 ÷ 0.02 millimeters.

## Approximate result

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

0.5 dm ≅ 50 mm

An alternative is also that one millimeter is approximately zero point zero two times zero point five 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

decimeters (dm) millimeters (mm)
1.5 decimeters 150 millimeters
2.5 decimeters 250 millimeters
3.5 decimeters 350 millimeters
4.5 decimeters 450 millimeters
5.5 decimeters 550 millimeters
6.5 decimeters 650 millimeters
7.5 decimeters 750 millimeters
8.5 decimeters 850 millimeters
9.5 decimeters 950 millimeters
10.5 decimeters 1050 millimeters