## 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 388 kilometers into millimeters we have to multiply 388 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

388 km → L(mm)

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

L(mm) = 388 km × 1000000 mm

L(mm) = 388000000 mm

The final result is:

388 km → 388000000 mm

We conclude that 388 kilometers is equivalent to 388000000 millimeters:

388 kilometers = 388000000 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 2.5773195876289E-9 × 388 kilometers.

Another way is saying that 388 kilometers is equal to 1 ÷ 2.5773195876289E-9 millimeters.

## Approximate result

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

388 km ≅ 388000000 mm

An alternative is also that one millimeter is approximately zero times three hundred eighty-eight 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)
389 kilometers 389000000 millimeters
390 kilometers 390000000 millimeters
391 kilometers 391000000 millimeters
392 kilometers 392000000 millimeters
393 kilometers 393000000 millimeters
394 kilometers 394000000 millimeters
395 kilometers 395000000 millimeters
396 kilometers 396000000 millimeters
397 kilometers 397000000 millimeters
398 kilometers 398000000 millimeters