How many pages can I fit into one book? This is a question that I get asked every now and then. They usually have a very long history and need to know at what point it would need to be split into two volumes. I think there are two different principles involved. First, is there a logical split because of the content? If you have two different family lines then it might make sense to split it into two different books. Second, if the book is so large that it is going to be hard on the binding as well as uncomfortable for the reader to hold, then two volumes makes sense. The general guidelines that I use for hardbound books is a minimum of 100 pages (50 sheets) and a maximum of 700 pages (350 sheets). If your book falls between these two numbers then you should be just fine. If you are less than 100 pages, then you might consider changing the binding to a soft bound book. The harder situation is when you are over 700 pages. There are a few things that you can do to make this fit into one book. You can change the margins to a smaller number and you can change the point size of the font to a smaller font. Both of these will decrease the number of pages in your book but will also make it a little harder to read. Hard choices. If your book is still too long, then you should decide to separate it into two volumes. Oh, and by the way, good work gathering and writing all that information. That many pages represents a huge effort.