In the mobile apps, click on the gear icon on the “Plan” tab and select the option to “Switch unit to KM” or “Switch unit to Miles”.
Log into myasics.com and click on the settings gear in the top right-hand corner of the page. Select Preferences and you will be directed to a page to switch your unit preferences. Just select whichever unit you'd like and save!
Access your Settings on the bottom of the app screen. You can then tap on the Distance Unit and it should let you toggle between the two.
To quickly change your units, you can tap the gear icon in the top right hand corner of your Training Plan screen.
Access your Settings from the 3 white lines at the top left hand corner of the screen. Once your settings are open, you just need to tap on the Distance Unit section and it will automatically toggle between the two.