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 4200 decimeters into millimeters we have to multiply 4200 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

4200 dm → L_(mm)

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

L_(mm) = 4200 dm × 100 mm

L_(mm) = 420000 mm

The final result is:

4200 dm → 420000 mm

We conclude that 4200 decimeters is equivalent to 420000 millimeters:

4200 decimeters = 420000 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 2.3809523809524E-6 × 4200 decimeters.

Another way is saying that 4200 decimeters is equal to 1 ÷ 2.3809523809524E-6 millimeters.

Approximate result

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

4200 dm ≅ 420000 mm

An alternative is also that one millimeter is approximately zero times four thousand two hundred 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