Amazon Best Sellers Rank Explained for Authors

From Tough Nickel:

As she looked at her book’s product page on Amazon, a new traditionally published author asked me what the Amazon Best Sellers Rank means. Did it tell her anything about how many sales were being made? Why are sales rankings always changing?

When it says “only 2 books left,” what does that mean? Though this author was traditionally published, many self-published authors struggle with figuring out what it all means, too.

So let me explain what all these confusing numbers and terms mean for authors.

Author Central

Whether you’re traditionally or self-published, you can claim your author profile on Amazon through Author Central. After your identity and claim to book titles are verified, you’ll be able to do the following:

  • Establish an author profile page on Amazon where you can post your bio, videos, and links to your blog or podcast RSS feed.
  • Access reports for Amazon Best Sellers Rank and NPD Bookscan rankings.
  • See the most recent customer reviews for your book without having to constantly visit your book product pages on Amazon.

Amazon Best Sellers Rank

The author who contacted me said she was checking “the numbers,” which I presumed was Amazon Best Sellers Rank, “a million times a day.” Dear authors, please don’t do this! Let me explain why.

For the Amazon Best Sellers Rank, sometimes referred to as “BSR,” the lower the BSR number, the higher you rank. Note that for your Kindle editions, your BSR shown on Author Central is for “Paid” books, meaning it doesn’t include Free Kindle Book Promotions. Also, note that this number tells you nothing about the number of books sold.

Your book’s BSR is a constantly moving target. The Amazon Customer Service documentation as of this post date had this to say about Best Sellers Rank:

The Amazon Best Sellers calculation is based on Amazon sales, and is updated hourly to reflect recent and historical sales of every item sold on Amazon. [Emphasis added for hourly.]

With hourly updates, your BSR could vary widely and wildly within the span of just one day. So unless you have the iron emotional stamina of a stock market day trader, basing the evaluation of your book’s success on Amazon’s BSR doesn’t help your physical and mental health.

Here’s something that freaks out authors. Your BSR can improve, sometimes dramatically, without you selling even one book. Or it can decline dramatically, even if you make sales, because there may be a flood of sales for other competing titles. This is because BSR is a calculation based on both recent and historical sales in comparison to other books, though KDP Support documentation says that recent activity is weighted more heavily.

I could not confirm on Amazon documentation if Kindle Unlimited KENP page reads impact BSR. What’s confusing is that KDP says sales ranking is based on “activity.” So are Kindle Unlimited reads considered “activity?” Logically, it seems like it might. But only Amazon knows.

In case you’re wondering, no, we don’t know the exact formula Amazon uses to calculate BSR. Like Google, they are not going to share that to prevent gaming of the system. Since BSR is a metric over which you have zero control, you should have zero worries over it.

. . . .

Different Format, Different Sales Rank

Something to also note is that your book title will have a separate BSR for Books, Kindle Store, and Audible, depending on which formats you’re offering. On the “Formats and editions” dropdown box next to your title on Author Central, you can choose which format’s BSR you’d like to view.

Sales rank can vary dramatically from edition to edition. Looking at mine for one particular day, I had a rank in the high 600K range for Kindle, 2.5 million for the paperback print edition, and in the 300K range for the audiobook.

Again, this tells you nothing valuable.

Historical Sales Rank

You can also click the “View historical Sales Rank” link for each of your titles on Author Central to see changes in your BSR over time for that title and each format. Let’s take a look at my first book, which I first published in 2011, then moved to KDP in 2014.

Looking at the graph of the BSR of the Kindle edition of my book, SWAG, for the period of 2014 to 2022, my highest BSR was in 2017 at 2,844. That’s pretty high! And that was three years after I published it on KDP. But it swings wildly from that high point, plummeting to rankings down in the millions.

Category Rankings

On your books’ listings on Author Central, you’ll see a link that says “See category rankings on Amazon.” This will send you to your book’s product page on Amazon. You’ll need to scroll down to Product Details to see your book’s ranking in topic categories and subcategories for each format.

This is where you’ll see how your book ranks in comparison to other books in your genre or topic. This is a more valuable ranking report than the placement in the overall BSR. Amazon shows where your book ranks highly within a few of the most popular categories.

Link to the rest at Tough Nickel