Typically the units in all reports will mimic the current "Display Units". Here's how to assign the default display units, https://support.numericalinnovations.com/support/discussions/topics/14000014793
Aperture reports are going to be either: Inch or Millimeter. To force the Apertures Units to match Display Units, please check the option "Adjust Aperture Units (to Display Units)" in the Options dialog. Go to menu: Setup / Options... (see below).