## 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 12 kilometers into millimeters we have to multiply 12 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

12 km → L(mm)

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

L(mm) = 12 km × 1000000 mm

L(mm) = 12000000 mm

The final result is:

12 km → 12000000 mm

We conclude that 12 kilometers is equivalent to 12000000 millimeters:

12 kilometers = 12000000 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 8.3333333333333E-8 × 12 kilometers.

Another way is saying that 12 kilometers is equal to 1 ÷ 8.3333333333333E-8 millimeters.

## Approximate result

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

12 km ≅ 12000000 mm

An alternative is also that one millimeter is approximately zero times twelve 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)
13 kilometers 13000000 millimeters
14 kilometers 14000000 millimeters
15 kilometers 15000000 millimeters
16 kilometers 16000000 millimeters
17 kilometers 17000000 millimeters
18 kilometers 18000000 millimeters
19 kilometers 19000000 millimeters
20 kilometers 20000000 millimeters
21 kilometers 21000000 millimeters
22 kilometers 22000000 millimeters