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 690 millimeters into decimeters we have to multiply 690 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

690 mm → L_(dm)

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

L_(dm) = 690 mm × 0.01 dm

L_(dm) = 6.9 dm

The final result is:

690 mm → 6.9 dm

We conclude that 690 millimeters is equivalent to 6.9 decimeters:

690 millimeters = 6.9 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.14492753623188 × 690 millimeters.

Another way is saying that 690 millimeters is equal to 1 ÷ 0.14492753623188 decimeters.

Approximate result

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

690 mm ≅ 6.9 dm

An alternative is also that one decimeter is approximately zero point one four five times six 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