The ratings are as follows:
K - K rated fan fiction is suitable for ages 5 and over, and does not have stories which contain adult themes, violence or bad language.
K+ - K+ rated fiction is suitable for older children, and contains only mild violence and minor language.
T - T rated fiction is suitable for teenagers (13 years and over), and contains minor adult themes, a little violence and some bad language.
M - M rated fanfiction is for teenagers aged 16 years and over, and contains adult themes, though not too explicit, bad language and violence.
Fanfiction.net does not accept NC-17 material (labelled MA by FictionRatings.com), which are stories that contain explicit material. Fanfiction.net deletes stories which contain material that is too explicit, usually when the matrial has been reported. All NC-17 material was moved to a site called Adult Fan Fiction.
Another rating from FictionRatings is B rated fiction, which is stories that contain material suitable for pre school children. This rating is included in the guidelines section on Fanfiction.net, but members cannot actually select it as a rating.
K - K rated fan fiction is suitable for ages 5 and over, and does not have stories which contain adult themes, violence or bad language.
K+ - K+ rated fiction is suitable for older children, and contains only mild violence and minor language.
T - T rated fiction is suitable for teenagers (13 years and over), and contains minor adult themes, a little violence and some bad language.
M - M rated fanfiction is for teenagers aged 16 years and over, and contains adult themes, though not too explicit, bad language and violence.
Fanfiction.net does not accept NC-17 material (labelled MA by FictionRatings.com), which are stories that contain explicit material. Fanfiction.net deletes stories which contain material that is too explicit, usually when the matrial has been reported. All NC-17 material was moved to a site called Adult Fan Fiction.
Another rating from FictionRatings is B rated fiction, which is stories that contain material suitable for pre school children. This rating is included in the guidelines section on Fanfiction.net, but members cannot actually select it as a rating.