Conversion formula

The conversion factor from millimeters to kilometers is 1.0E-6, which means that 1 millimeter is equal to 1.0E-6 kilometers:

1 mm = 1.0E-6 km

To convert 20 millimeters into kilometers we have to multiply 20 by the conversion factor in order to get the length amount from millimeters to kilometers. We can also form a simple proportion to calculate the result:

1 mm → 1.0E-6 km

20 mm → L_(km)

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

L_(km) = 20 mm × 1.0E-6 km

L_(km) = 2.0E-5 km

The final result is:

20 mm → 2.0E-5 km

We conclude that 20 millimeters is equivalent to 2.0E-5 kilometers:

20 millimeters = 2.0E-5 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 50000 × 20 millimeters.

Another way is saying that 20 millimeters is equal to 1 ÷ 50000 kilometers.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty millimeters is approximately zero kilometers:

20 mm ≅ 0 km

An alternative is also that one kilometer is approximately fifty thousand times twenty millimeters.

Conversion table

millimeters to kilometers chart

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