How To: Set the distance units for my driving directions
Instructions provided describe how to set the distance units for driving directions. Distance units are determined by the current data frame's display units. Metric display units (mm, cm, m, dm, km) result in distance values in kilometers. Any other display units result in distance values in miles.
To change the display units, and therefore the distance values, right-click the current data frame and click Properties. Under the General tab, click the Units Display dropdown arrow and click the appropriate units.