HSMAdvisor Units System (in/mm)
HSMAdvisor operates both in imperial(in) and metric(mm) systems.
Every field on the main Speeds and Feeds page can toggle between "in" and "mm" simply by clicking on the in/mm label located next to the field.
For example, if you enter 0.5 in diameter, you can convert it to 12.7 by clicking on the "in" label like so:
It is totally normal to have some fields metric and others imperial.