On the website:
Open the left sidebar menu and select Generator under Plan Settings.
Scroll down to the Time and Units section to find the 'Preferred units' option, where you can switch between U.S. Standard and Metric units.

On the app:
Go into Preferences in the lower right and select the Generator Settings option in the Plan Settings section.
The top 'Preferred units' option is where you can switch between U.S. Standard and Metric units. Just be sure to save before leaving this page.
