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 721 decimeters into millimeters we have to multiply 721 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

721 dm → L_(mm)

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

L_(mm) = 721 dm × 100 mm

L_(mm) = 72100 mm

The final result is:

721 dm → 72100 mm

We conclude that 721 decimeters is equivalent to 72100 millimeters:

721 decimeters = 72100 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 1.3869625520111E-5 × 721 decimeters.

Another way is saying that 721 decimeters is equal to 1 ÷ 1.3869625520111E-5 millimeters.

Approximate result

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

721 dm ≅ 72100 mm

An alternative is also that one millimeter is approximately zero times seven hundred twenty-one 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