Amazon BSR to sales estimator
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Amazon does not publish how Best Sellers Rank maps to sales, so every converter is an estimate. This one uses KDPTop's curve for Amazon.com: daily units = 12,000 x BSR^-0.85 for print books and 18,000 x BSR^-0.85 for Kindle ebooks. Use it for orders of magnitude, not forecasts.
- Sales per day (estimate)
- -
- Sales per month (30 days)
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- Royalty per month
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Estimate only. Rank weights recent activity more heavily, so one good day can lift it well above what the book sells on average. Work out your royalty per sale.
Curve from KDPTop's sales model, by the team behind kdp123. Calculated in your browser.
Rank to sales on this curve
| BSR | Print books / day | Kindle ebooks / day |
|---|---|---|
| 1 | 12000 | 18000 |
| 100 | 239 | 359 |
| 1,000 | 34 | 51 |
| 5,000 | 8.6 | 13 |
| 10,000 | 4.8 | 7.2 |
| 50,000 | 1.2 | 1.8 |
| 100,000 | 0.7 | 1 |
| 250,000 | 0.3 | 0.5 |
| 500,000 | 0.2 | 0.3 |
| 1,000,000 | 0.1 | 0.1 |
Limits
- Only for the overall Amazon.com rank in Books or the Kindle Store, not sub-category ranks.
- Rank is relative: it can move when other books sell more or less, even if your sales stay the same. Seasonality and promotions shift the curve.
- Units only. Kindle Unlimited page reads are paid from the KDP Select fund, not per sale.
- Results under 10 a day are rounded to one decimal; above that, to whole units.
Questions
- How many books a day is a BSR of 100,000?
- On this curve, about 0.7 print books a day, or 1 Kindle ebooks a day, on Amazon.com. Treat it as an order of magnitude: real sales at the same rank vary by season and by how steady the sales are.
- Is there an official formula for BSR?
- No. Amazon says rank is based on a book's customer activity relative to other books, weights recent activity more heavily, updates at least once a day (changes can take up to 2 days to show), and is not an accurate way to track sales. Every BSR-to-sales tool is an estimate.
- Do paperback and ebook share one rank?
- No. Each format has its own Best Sellers Rank, so convert each one with the matching store. Category ranks in Books lists combine all of a title's formats in that category; Kindle Store ranks are for the ebook only.
The rules behind it
- KDP ebook royalties: the 35% and 70% options
- KDP paperback royalties: 60% or 50% minus printing cost
- KENP royalties: how KDP pays for Kindle+ pages read