Amazon Best Seller Rank

The Amazon Best Seller rank is calculated based on the sales of a product and undergoes hourly updations. The rank assignment also considers the current sales of the product and the sales history too. A product with a rank of #1 means it has recently sold more than any other product in that category, on that store. It sells better than all the other products in that particular category,and therefore gets a higher ranking than the other products.

The Amazon BSR calculation is not based on the product reviews or rating. It is solely based on the sales rate. Also the sales rank of a product differs in different Amazon marketplaces.

Eg.A product that has a BSR of 2342 on Amazon.com, may have a sales rank of 123 in Amazon.co.uk!

The algorithm that ranks products and assigns Amazon BSR has predictive factors in order to analyze the future sales of the product too.This means you can’t really expect your sales rank to go up with a sudden influx in sales. Sometimes there is a lag between an increase in sales, and an improvement in a ranking because BSR for the 10k top Amazon sellers are calculated hourly, whereas it takes a lag of 2-3 hours for the other products

The BSR is not a good estimator for sales. According to Amazon, the Best Sellers list is a good indicator of how well a product is selling overall, it doesn't always indicate how well an item is selling among other similar items of the best sellers on Amazon. Considering the fact that BSR values change hourly and are very fluctuating, it is not the most optimal factor for predicting sales. But it is the best you can consider in comparison to inventory levels, number of reviews, fulfillment methods etc to predict sales.

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