Fanfiction spans an enormous range of lengths, from a quick scene you can read on a coffee break to multi-year sagas longer than most published novels. Word count is one of the most useful things to check before you start a fic, and one of the most useful things to filter by.
Here's a rough map of what the numbers mean, and how to find fics that fit the time you have.
A rough guide to fanfic lengths
Under 1,000 words is a drabble or ficlet — a single scene or moment. Roughly 1,000 to 10,000 words is a typical one-shot, readable in one sitting. From 10,000 to 50,000 words you're into novella territory, often a multi-chapter story with real plot.
Above 50,000 words is novel-length, and slow burns frequently run past 100,000. The truly epic WIPs and completed sagas can exceed 500,000 or even a million words — longer than most book trilogies.
How to find fics by length
AO3's filters include a word-count range, so you can ask for, say, completed fics between 40,000 and 100,000 words. This is the best way to match a fic to your available time — a long flight versus a lunch break.
The Fanfict Reader app lets you set a word-count range alongside your other filters, so you can line up exactly the right-sized read before you start.
Frequently Asked Questions
What counts as a long fanfic?
Most readers consider anything over about 50,000 words 'long,' since that's novel length. Slow-burn and epic fics regularly pass 100,000 and sometimes run into the hundreds of thousands.
What is a drabble?
Strictly, a drabble is exactly 100 words. More loosely, fandom uses it for any very short fic — a quick scene or moment under about 1,000 words.
What's the longest fic on AO3?
The longest works run well over a million words — longer than the entire published Lord of the Rings. These are usually long-running serial WIPs updated over many years.