## 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 100 kilometers into millimeters we have to multiply 100 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

100 km → L(mm)

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

L(mm) = 100 km × 1000000 mm

L(mm) = 100000000 mm

The final result is:

100 km → 100000000 mm

We conclude that 100 kilometers is equivalent to 100000000 millimeters:

100 kilometers = 100000000 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-8 × 100 kilometers.

Another way is saying that 100 kilometers is equal to 1 ÷ 1.0E-8 millimeters.

## Approximate result

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

100 km ≅ 100000000 mm

An alternative is also that one millimeter is approximately zero times one hundred 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)
101 kilometers 101000000 millimeters
102 kilometers 102000000 millimeters
103 kilometers 103000000 millimeters
104 kilometers 104000000 millimeters
105 kilometers 105000000 millimeters
106 kilometers 106000000 millimeters
107 kilometers 107000000 millimeters
108 kilometers 108000000 millimeters
109 kilometers 109000000 millimeters
110 kilometers 110000000 millimeters