Conversion formula

The conversion factor from millimeters to decimeters is 0.01, which means that 1 millimeter is equal to 0.01 decimeters:

1 mm = 0.01 dm

To convert 300 millimeters into decimeters we have to multiply 300 by the conversion factor in order to get the length amount from millimeters to decimeters. We can also form a simple proportion to calculate the result:

1 mm → 0.01 dm

300 mm → L_(dm)

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

L_(dm) = 300 mm × 0.01 dm

L_(dm) = 3 dm

The final result is:

300 mm → 3 dm

We conclude that 300 millimeters is equivalent to 3 decimeters:

300 millimeters = 3 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.33333333333333 × 300 millimeters.

Another way is saying that 300 millimeters is equal to 1 ÷ 0.33333333333333 decimeters.

Approximate result

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

300 mm ≅ 3 dm

An alternative is also that one decimeter is approximately zero point three three three times three hundred millimeters.

Conversion table

millimeters to decimeters chart

For quick reference purposes, below is the conversion table you can use to convert from millimeters to decimeters