## 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 120 kilometers into millimeters we have to multiply 120 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

120 km → L(mm)

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

L(mm) = 120 km × 1000000 mm

L(mm) = 120000000 mm

The final result is:

120 km → 120000000 mm

We conclude that 120 kilometers is equivalent to 120000000 millimeters:

120 kilometers = 120000000 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-9 × 120 kilometers.

Another way is saying that 120 kilometers is equal to 1 ÷ 8.3333333333333E-9 millimeters.

## Approximate result

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

120 km ≅ 120000000 mm

An alternative is also that one millimeter is approximately zero times one hundred twenty 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)
121 kilometers 121000000 millimeters
122 kilometers 122000000 millimeters
123 kilometers 123000000 millimeters
124 kilometers 124000000 millimeters
125 kilometers 125000000 millimeters
126 kilometers 126000000 millimeters
127 kilometers 127000000 millimeters
128 kilometers 128000000 millimeters
129 kilometers 129000000 millimeters
130 kilometers 130000000 millimeters