For the page count in firmware 4.16.x and beyond:
- ePubs are still using the Adobe RMSDK algorithm. Hence, a page can take more than one screen, or with a small font on a large screen, you could have more than one page.
- kepubs per-chapter page numbering is unchanged. Each screen is counted as a page. This gets recalculated when you change the font settings.
- kepub full book page numbering is now using the same method as the per-chapter numbering.
And for the record:
- Before 4.16.x the kepub full book page numbering was based on 320 words per page.
- The chapter graph shown in the Reading Progress for kepubs uses the word count.