ConvertOctopus

Unit Converter

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 4 decimeters into millimeters we have to multiply 4 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

4 dm → L(mm)

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

L(mm) = 4 dm × 100 mm

L(mm) = 400 mm

The final result is:

4 dm → 400 mm

We conclude that 4 decimeters is equivalent to 400 millimeters:

4 decimeters = 400 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.0025 × 4 decimeters.

Another way is saying that 4 decimeters is equal to 1 ÷ 0.0025 millimeters.

Approximate result

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

4 dm ≅ 400 mm

An alternative is also that one millimeter is approximately zero point zero zero three times four 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)
5 decimeters 500 millimeters
6 decimeters 600 millimeters
7 decimeters 700 millimeters
8 decimeters 800 millimeters
9 decimeters 900 millimeters
10 decimeters 1000 millimeters
11 decimeters 1100 millimeters
12 decimeters 1200 millimeters
13 decimeters 1300 millimeters
14 decimeters 1400 millimeters