## 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 30 decimeters into millimeters we have to multiply 30 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

30 dm → L(mm)

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

L(mm) = 30 dm × 100 mm

L(mm) = 3000 mm

The final result is:

30 dm → 3000 mm

We conclude that 30 decimeters is equivalent to 3000 millimeters:

30 decimeters = 3000 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.00033333333333333 × 30 decimeters.

Another way is saying that 30 decimeters is equal to 1 ÷ 0.00033333333333333 millimeters.

## Approximate result

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

30 dm ≅ 3000 mm

An alternative is also that one millimeter is approximately zero times thirty 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)
31 decimeters 3100 millimeters
32 decimeters 3200 millimeters
33 decimeters 3300 millimeters
34 decimeters 3400 millimeters
35 decimeters 3500 millimeters
36 decimeters 3600 millimeters
37 decimeters 3700 millimeters
38 decimeters 3800 millimeters
39 decimeters 3900 millimeters
40 decimeters 4000 millimeters