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 250 decimeters into millimeters we have to multiply 250 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

250 dm → L_(mm)

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

L_(mm) = 250 dm × 100 mm

L_(mm) = 25000 mm

The final result is:

250 dm → 25000 mm

We conclude that 250 decimeters is equivalent to 25000 millimeters:

250 decimeters = 25000 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 4.0E-5 × 250 decimeters.

Another way is saying that 250 decimeters is equal to 1 ÷ 4.0E-5 millimeters.

Approximate result

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

250 dm ≅ 25000 mm

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