BSR

Best Seller Rank. Amazon's per-category sales rank, updated hourly. Lower BSR means more sales — a BSR of 1 in a category is the top seller in that category. BSR is marketplace-specific (DE BSR ≠ FR BSR).

BSR is calculated from recent sales velocity weighted toward the most recent sales. It exists at every category level — main category, subcategory, and deeper. AgentXray uses Keepa BSR history to translate rank into estimated monthly units sold for EU marketplaces.

Related: Sales Velocity, Keepa