The number of words used in a novel is typically dependent on the author; however, the rule of thumb for a commercially successful novel is between 80,000 and 89,999 words. The length of a novel often depends on the intended target audience and the genre.
According to The Writer's Workshop website, young adult fiction ranges from 50,000 to the 70,000 word range, while fantasy novels can go to well over 200,000 words. When submitting a novel for publication, it is recommended to submit a manuscript that is in the average word range of 80,000 to 89,999 words. According to a post by Chuck Sambuchino on the "Writer's Digest" website, 70,000 words is too short for a novel and 110,000 or more words is too long.