20 millimeters in decimeters

Result

The conversion result is: 20 millimeters is equivalent to 0.2 decimeters.^[1]

Conversion formula
How to convert 20 millimeters to decimeters?

We know (by definition) that: 1 mm = 0.01 dm.

We can set up a proportion to solve for the number of decimeters.

1 mm / 20 mm = 0.01 dm / x dm

Now, we cross multiply to solve for our unknown x:

x dm = (20 mm / 1 mm) * 0.01 dm → x dm = 0.2 dm

Conclusion:

20 mm = 0.2 dm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 decimeter is equal to 5 times 20 millimeters.

It can also be expressed as: 20 millimeters is equal to 1 / 5 decimeters.

Approximation

An approximate numerical result would be: twenty millimeters is about zero decimeters, or alternatively, a decimeter is about zero times twenty millimeters.