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 840 millimeters into kilometers we have to multiply 840 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

840 mm → L_(km)

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

L_(km) = 840 mm × 1.0E-6 km

L_(km) = 0.00084 km

The final result is:

840 mm → 0.00084 km

We conclude that 840 millimeters is equivalent to 0.00084 kilometers:

840 millimeters = 0.00084 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 1190.4761904762 × 840 millimeters.

Another way is saying that 840 millimeters is equal to 1 ÷ 1190.4761904762 kilometers.

Approximate result

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

840 mm ≅ 0.001 km

An alternative is also that one kilometer is approximately one thousand one hundred ninety point four seven six times eight hundred forty 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