If you hover over the options in the Kindle driver you will see hints.
Page count calculation methodThere are multiple ways to generate the page number information. If a page count is given then the book will be divided into that many pages. Otherwise the number of pages will be approximated using one of the following methods.
- fast: 2300 characters of uncompressed text per page.
- accurate: Based on the number of chapters, paragraphs, and visible lines in the book. This method is designed to simulate an average paperback book where there are 32 lines per page and a maximum of 70 characters per line.
- pagebreak: The "pagebreak" method uses the presence of <mbp:pagebreak> tags within the book to determine pages.
Methods other than "fast" are going to be much slower. Further, if "pagebreak" fails to determine a page count accurate will be used, and if "accurate" fails fast will be used.
Custom column name to retrieve page counts fromIf you have a custom column in your library that you use to store the page count of books, you can have calibre use that information, instead of calculating a page count. Specify the name of the custom column here, for example, #pages.
Custom column name to retrieve calculation method fromIf you have a custom column in your library that you use to store the preferred method for calculating the number of pages for a book, you can have calibre use that method instead of the default one selected above. Specify the name of the custom column here, for example, #pagemethod. The custom column should have the values: fast, accurate or pagebreak.