How Long Should My Book Be?

The accepted average for business book is between 50k and 60k words. Authors usually prefer to talk in terms of pages, so with a standard format that would work out at about 250 pages.

However, I've seen recent data suggest the average length of a business book is falling to between 40k to 50k words.

That matches my experience.

Recently I've written a couple of books that were 20k–25k words each. That’s probably 100–125 pages.

They were both written for a medical practitioner to give to his patients to explain what would take place during their procedures, how best to prepare, and how best to recover.

Those books were short because they only needed to be short.

As a general rule, once you've given the reader the information they need, you can stop.

There’s no minimum word count (though it's unusual to have books that are much shorter than 80 pages).