Open Google maps. Next to the search area you'll see a series of 4 lines. Click on them and it will open a menu area on the lefthand side. Navigate to settings, then to units of measurement. You have auto, kilometers and miles has an option.
In the latest version of Google Maps for Android, you can change units from Kilometer to Mile. To change Distance Units in Google Maps on you Android phone or tablet do as follows:
1. Make sure you have updated Google Maps to its latest version
2. Tap the settings icon on the bottom left.
3. Select "Settings"
4. Select "Distance units" and choose one of these options: Automatic, Kilometers, Miles