This rating guide is intended to give authors the option to expand the pre-existing system of assigning a target audience (a requirement for ISBN metadata) or age range to your creative work and more effectively communicate that information to readers.
At the IBRS, we highly encourage the use of Content Warnings alongside use of this rating system to better inform readers of what they can expect in your story. The below sites can help you better understand Content Warnings and determine which to include:
Book Trigger Warnings
Trigger Warning Database
Starter Guide to Content Warnings
The inclusion of the "bang" or exclamation point indicates that the author elected to include a content warning page or list in their book for more detailed information to forewarn readers.
Click on any picture or title to be taken to an expanded definition.
This rating indicates that the book is suitable for all ages and contains little to no content that would be offensive to young children. These books are specifically intended for children who cannot read independently or are learning to read.
This rating indicates that the book is suitable for all readers and contains little to no content that would be considered offensive. These books are are appropriate for independent readers of any age.
This rating indicates that some material in the book may be considered inappropriate for children under 13. These books are specifically intended for teenagers and up.
This rating indicates that the book contains material suited for more mature readers, and may contain content inappropriate for younger readers or that some readers may find uncomfortable. These books are specifically intended for more mature readers.
This rating indicates that the book contains graphic content that readers may find offensive or uncomfortable. These books are typically intended for adult readers only and may contain very uncomfortable imagery, topics, themes, and content.
If your work meets any of the criteria in the three-pronged "Miller Test," we recommend rating your book Adult (A) or Mature (M) and incorporating it into your book design using our provided placement suggestions as an added measure of notifying readers of your intended audience.
As a community run rating system, the authors act as their own review board. Rating your book honestly helps maintain credibility within the community.