Kindle BSR to Sales Calculator
Type a Kindle Store Best Sellers Rank and get a rough range of eBook sales a day.
Estimate only. Not affiliated with, endorsed by or sponsored by Amazon. Amazon publishes no rank-to-sales figures. This range comes from a published third-party model and our own stated assumption, not from Amazon data.
Where the numbers come from
The middle of the range is a published power-law fit for ebooks: sales a day of about 100,000 divided by the rank, so rank 100,000 sells about one copy a day (Old tails: a crude power law fit on ebook sales, Win-Vector Blog, April 2014). That source says its fit looks plausible for ranks of about 200 to 150,000, so figures outside that are rougher, and the calculator takes ranks from 10. The low and high ends are half and double that. That spread is our own assumption: published estimates disagree by about that much (for example, one published table puts rank 1,000 at 120 a day against the model's 100). Model file: bsr-model-2026-11.json.
The model covers Kindle eBooks on Amazon.com only. We have read no published model for paperback ranks, so this page does not estimate them.
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FAQ
- How many sales a day is a BSR of 10,000?
- On this model, about 10 Kindle eBooks a day, in a range of 5 to 20.
- Is BSR the same as sales?
- No. BSR ranks a book against others by recent sales, with recent sales weighted more. It moves hour by hour, so one reading gives a rough picture only.
- Why a range and not one number?
- Because published estimates disagree, by about two times either way. A single number would claim a precision nobody has.
- Does this tool look up ranks on Amazon?
- No. You type the rank. Nothing is fetched from Amazon and nothing you type leaves your browser.