Hi Caleb - You can change your default distance units in the route planner by clicking the settings icon in the top right corner of the page (a gear icon). Also, when viewing a route on the route's home page you can toggle between miles or km using the switch underneath the map next to the distance counter.
I meant says
How do I change the units from kilometers to miles? There is even a place where it ways the units are in miles, but they have to be in kilometers, because the numbers are the kilometer distance, not miles.