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 8420 decimeters into millimeters we have to multiply 8420 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

8420 dm → L_(mm)

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

L_(mm) = 8420 dm × 100 mm

L_(mm) = 842000 mm

The final result is:

8420 dm → 842000 mm

We conclude that 8420 decimeters is equivalent to 842000 millimeters:

8420 decimeters = 842000 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 1.187648456057E-6 × 8420 decimeters.

Another way is saying that 8420 decimeters is equal to 1 ÷ 1.187648456057E-6 millimeters.

Approximate result

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

8420 dm ≅ 842000 mm

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