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 490 millimeters into decimeters we have to multiply 490 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

490 mm → L_(dm)

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

L_(dm) = 490 mm × 0.01 dm

L_(dm) = 4.9 dm

The final result is:

490 mm → 4.9 dm

We conclude that 490 millimeters is equivalent to 4.9 decimeters:

490 millimeters = 4.9 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.20408163265306 × 490 millimeters.

Another way is saying that 490 millimeters is equal to 1 ÷ 0.20408163265306 decimeters.

Approximate result

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

490 mm ≅ 4.9 dm

An alternative is also that one decimeter is approximately zero point two zero four times four hundred ninety 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