I don’t claim to have it all figured out yet, but I’m here to share what I know about ratings on AO3 and how to use them to help your target audience find your fanfic.
You might have noticed AO3 has little four-square grids next to every fanfic. Here’s an example from the original version of Getting Out of Fuchsia.

The upper right corner is for the content rating: G for general audiences, T for teens, M for mature, and E for explicit. This seems pretty straightforward, as I think most people have an idea of what wouldn’t be suitable for children, what would only be suitable for adults, and I certainly hope people know what explicit means. I will say that I appreciate the distinction between mature and explicit because there are some people who will read one but not the other, and the fact that Wattpad doesn’t differentiate has always been a bit of an issue there.
The upper right corner is to show what kind of romantic/sexual relationships are in the fanfic. Most of these are pretty self-explanatory as well, but I will point out that the Gen category is important to be aware of if you’re a person like me. “Gen” is the category for a fanfic that doesn’t have any romantic relationships or where the only ones aren’t the focus of the story, and it’s represented by a green circle with a dot in the middle. I’m probably not the right person to ask about the “other relationships” category, but my best guess is that it’s for relationships involving a person/people who is/are non-binary.
In the lower left corner you have marks to show whether there are any content warnings that apply to the story. This might include warnings for graphic violence, death of important characters, rape/non-consensual acts, or underage sex. I find it a little odd that these are the only warnings, but you can put anything you want to warn about in tags. So trigger warnings, language warnings, and so on could find a home there.
Finally, the lower right corner is to show if a work is complete or ongoing. Easy enough to spot. A green check mark for complete and a red circle with a line through it for incomplete.
The last thing I’ll note is that all of these can be blank, and that means different things depending on which box. If the content rating is blank, that means it could have anything in it, so proceed with caution. Personally, I’m not going to be reading anything unrated unless I have a really good idea of what the fanfic is before I click on it, so I wouldn’t recommend leaving things unrated if you’re looking for readers like myself. On the other hand, if you’re ok with people only clicking on it if they’re fine with taking a risk and you want to surprise them, feel free.
It’s a similar story with the relationships and completion status boxes, although it’s probably not a big deal to most people if there’s a surprise romantic relationship as opposed to a surprise that’s a bit more graphic (as with the lack of content ratings). So people probably won’t be bothered if you don’t mark what kind of relationships are in the fic, although the only reason I can think of for not doing so is the surprise factor. You’ll just miss out on having readers come to the fic because they were searching for a particular type of romance. And not marking if your story is ongoing or finished? Well that just seems annoying.
The content warnings box is different because a blank box here means that none of the standard warnings apply. In other words, this isn’t a sign that the author is trying to surprise you, it’s the author telling you that certain types of potentially objectionable content are guaranteed to not be present. If the author is trying to surprise you about any of these, there will be a completely different marking to show it.
Personally, I like making use of all the boxes, although I do maintain the element of surprise a bit by adding warnings for content that might pop up but isn’t guaranteed. Will any of the main characters die? Well, you’d better be prepared for the possibility! I prefer to over-warn as opposed to under-warn.
My advice to you? Be aware of what the boxes mean and make your decisions wisely. It’s not going to help you or your readers if you mark something incorrectly, but a smart choice can draw in the readers and make the fanfic experience more enjoyable for everyone.





