BSR (Best Sellers Rank)
A per-category rank based on recent sales velocity relative to everything else in that category.
Why it matters
BSR is a relative, fast-moving measure, it says how you sold compared to the rest of the category over a short window, not how much you sold. It is useful as a directional signal and unreliable as an absolute one.
In practice
Rank-to-sales estimates vary enormously between categories: a BSR of 5,000 in a dense category can mean many times the daily units of the same rank in a sparse one. BSR is also visible to competitors, which is precisely why so much third-party sourcing tooling is built on top of it.
Related terms
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