I used to not count DNF’d books as completed, but recently changed my mind a bit. I feel like if you actively decide not to finish you’ve already completed it in some way. Also allows me to rate and review on goodreads for example. What do you guys do? Do you count them? Is there a certain amount you have to read before you consider a DNF book completed? Or do you not think of them completed at all?
Mostly if I DNF, I do it pretty early in the book. But I count it as “read” for my Goodreads annual reading goal if I get at least 70% through. For example, if there’s a book for one of my book clubs that I hate, I’ll power through to about that point. My reading goal is just for me, so it’s helpful to know which books I spent a bunch of time on. And in most cases, if I’ve read that much of a book, I’d be able to discuss it intelligently (especially if it’s non-fiction). But if someone asked me if I read a certain book, I’d tell them I didn’t get all the way through it.
I also keep two DNF shelves on Goodreads to track books I quit early on. One is for books I DNFed because I didn’t like the book. And the other for very long books that I might finish at some point. For example, I’ve been plugging away at the complete Sherlock Holmes for some time, but there’s only so much you can read at once.