## Conversion formula

The conversion factor from kilometers to millimeters is 1000000, which means that 1 kilometer is equal to 1000000 millimeters:

1 km = 1000000 mm

To convert 1 kilometers into millimeters we have to multiply 1 by the conversion factor in order to get the length amount from kilometers to millimeters. We can also form a simple proportion to calculate the result:

1 km → 1000000 mm

1 km → L(mm)

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

L(mm) = 1 km × 1000000 mm

L(mm) = 1000000 mm

The final result is:

1 km → 1000000 mm

We conclude that 1 kilometers is equivalent to 1000000 millimeters:

1 kilometers = 1000000 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 1.0E-6 × 1 kilometers.

Another way is saying that 1 kilometers is equal to 1 ÷ 1.0E-6 millimeters.

## Approximate result

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

1 km ≅ 1000000 mm

An alternative is also that one millimeter is approximately zero times one kilometers.

## Conversion table

### kilometers to millimeters chart

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

kilometers (km) millimeters (mm)
2 kilometers 2000000 millimeters
3 kilometers 3000000 millimeters
4 kilometers 4000000 millimeters
5 kilometers 5000000 millimeters
6 kilometers 6000000 millimeters
7 kilometers 7000000 millimeters
8 kilometers 8000000 millimeters
9 kilometers 9000000 millimeters
10 kilometers 10000000 millimeters
11 kilometers 11000000 millimeters