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 250 millimeters into kilometers we have to multiply 250 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

250 mm → L_(km)

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

L_(km) = 250 mm × 1.0E-6 km

L_(km) = 0.00025 km

The final result is:

250 mm → 0.00025 km

We conclude that 250 millimeters is equivalent to 0.00025 kilometers:

250 millimeters = 0.00025 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 4000 × 250 millimeters.

Another way is saying that 250 millimeters is equal to 1 ÷ 4000 kilometers.

Approximate result

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

250 mm ≅ 0 km

An alternative is also that one kilometer is approximately four thousand times two hundred fifty 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