###### Asked in Units of Measure, Length and Distance

# How many km is fifty mm?

## Answer

###### Wiki User

###### 10/09/2008

You're going to be writing a small length in terms of a really
long one. That means the answer is going to be *really* small.
You've chosen to express 50 mm in km, and that's 50 millimeters or
50 *thousandths* of a meter in terms of kilometers or
*thousands* of meters. To convert millimeters to meters,
you'll have to divide by 1,000. And to convert meters to
kilometers, you'll have to divide by 1,000. So to convert
millimeters to kilometers, you'll have to divide by 1,000,000 (a
*million*), or 106. 50 mm / 106 = 50 x 10-6 km or **5 x 10-5
kilometers**, or **0.00005 kilometers**.