The BookDigits rating system is unlike anything else on the web, which means there's a bit of a learning curve. But don't worry, you'll pick it up very quickly!

A rating is comprised of seven elements, and this quick tutorial will help you get familiar with each one.


In place of the traditional five-star ranking, BookDigits uses the academic scale from A+ to F.

L/E Ratio

Some books are meant to be read as literary works of art, and some are intended to be pure commercial entertainment. A lot of books fall in between, and that's what the L/E Ratio measures. Neither side of the spectrum is better than the other. The purpose of the L/E ratio is to help you identify the style of books you enjoy reading. Try out the L/E Ratio slider below.

Theme Breakdown

Traditional genres such as sci-fi, romance, and fantasy are too broad and vague to be useful. BookDigits uses themes instead. You can choose up to 10 themes per book and set a percentage for each theme. For example, a book traditionally categorized as sci-fi could be 50% aliens, 30% military, and 20% love. Try to keep themes short, but descriptive.


How hard was the book to put down? Keep in mind that the Addictiveness score should not reflect the overall quality of a book – that's what the grade is for. Bad books can be addictive, and good ones don't have to be. Try out the Addictiveness slider below.

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Movie Potential

Would the book make a good movie? 2 Thumbs Up = guaranteed blockbuster, 1 Thumb Up = solid film, 1 Thumb Down = probably not script-worthy, and 2 Thumbs Down = any director who tries it is a fool. If the book has already been turned into a movie, score it on how much you thought it deserved to get a film adaptation – not on how well the movie actually came out. Try out the Movie Potential slider below.


The re-readability metric asks a simple question: how eager are you to read the book again?
Try out the Re-readability slider below.

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You have 500 characters to summarize your opinion of the book. Don't waste it on rehashing the plot. Tell the world how you really feel. (Including a comment is optional.)