I use several ways to get a "good" page count.
- I get most of my books from Amazon and they often will give an "estimate page count" for e-books even if they don't have a print book to go with them.
- Goodreads has a lot of page counts for books, even if it isn't the same version some times. I have chosen to use the mass market paperback counts when available to get a somewhat consistent number.
- If those two don't work, I estimate the length based on the number of locations in the book. I think locations are a Kindle specific item (not sure), but there is probably something similar in other e-books that could be used. I have kept track of the books where the pages are known and use that as an estimate for the weighted average locations/page (between 16 and 19 works for me).
- An alternative way if you use Calibre is the "page count" plugin that estimates the page count. I don't use this one since almost everything I have is straight from Amazon, I don't normally bother downloading everything to Calibre.
/If anyone knows what other formats/readers use instead of locations I would be interested.
//Thanks.