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 1242 millimeters into decimeters we have to multiply 1242 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

1242 mm → L_(dm)

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

L_(dm) = 1242 mm × 0.01 dm

L_(dm) = 12.42 dm

The final result is:

1242 mm → 12.42 dm

We conclude that 1242 millimeters is equivalent to 12.42 decimeters:

1242 millimeters = 12.42 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.080515297906602 × 1242 millimeters.

Another way is saying that 1242 millimeters is equal to 1 ÷ 0.080515297906602 decimeters.

Approximate result

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

1242 mm ≅ 12.42 dm

An alternative is also that one decimeter is approximately zero point zero eight one times one thousand two hundred forty-two 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