What is Amazon Best Sellers Rank (BSR)?
Best Sellers Rank (BSR) is a product’s place among the products in its category, based on sales. Amazon’s Best Sellers lists show “our most popular products based on sales”; a lower number means more sales.
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1.How it moves
For books, KDP’s help explains the rank in detail. It is relative to other books, so it “can change even when your book’s level of activity stays the same.” It reflects recent and past sales, with recent ones weighted more. It updates at least once a day, and changes can take up to two days to show.
A book has a rank in each of its categories, and each format (Kindle, paperback, hardcover, audiobook) has its own.
2.What it can’t tell you
KDP says the rank “is not an accurate way to track your book’s activity or compare its activity in relation to books in other categories.” Tools that turn BSR into daily sales are estimating. Use it to watch a trend, not as a sales count.