Find this on your Amazon book page under “Product details → Best Sellers Rank”. Use the main category rank (e.g. “#15,000 in Kindle Store”), not the sub-category.
Estimated sales
high confidenceHow BSR maps to sales
Amazon doesn't publish the exact formula between BSR and sales-per-day — it's proprietary. But independent KDP analytics platforms have aggregated enough data over the years to build a reliable approximation. The relationship is logarithmic: rank 1 sells around 7,000 copies/day on Kindle, rank 100 sells about 1,000/day, rank 10,000 sells about 13/day, and rank 100,000+ sells less than a copy a day.
This calculator interpolates between these anchor points using a log-log curve and applies a multiplier for the format (Kindle, paperback, audiobook). It's the same approach used by every BSR estimator on the market — none of them are official, but they're directionally reliable when you stay above rank 500,000.
What good looks like
- Rank 1–103,000+ sales/day
- Rank 100~1,000 sales/day
- Rank 1,000~120 sales/day
- Rank 10,000~13 sales/day
- Rank 50,000~3 sales/day
- Rank 100,000~1 sale/day
- Rank 500,000+<1 sale/week
These are Kindle Store figures. Multiply by 0.55 for paperback (Books), 0.7 for Audible.
Frequently Asked Questions
What is BSR (Best Sellers Rank)?
Best Sellers Rank is Amazon's hourly-updated ranking of every book against every other book in its store. The #1 book is the bestselling book in the store right now; rank 100,000 means there are about 99,999 books selling more copies per hour than this one. Rank changes constantly based on recent sales velocity.
How accurate is BSR → sales estimation?
It's an approximation — not a forecast. The actual sales-per-rank curve varies by category, season, and how recently the book was published. The calculator uses a log-interpolated curve based on widely-cited aggregate data from independent KDP analytics services. Use it for directional research, not for income projections.
Why is BSR higher numbers = worse rank?
Amazon ranks bestsellers as #1, #2, #3 etc — lower rank = better-selling. So 'rank 500' is far better than 'rank 50,000'. When you see a book at rank 2,500,000 it's selling fewer than one copy a week.
What's a 'good' BSR for an indie author?
Context-dependent. Rank 100,000 typically means about 1 sale/day — survivable for a new release; not a career. Rank 10,000 means roughly 10–15 sales/day, which is a part-time income. Rank 1,000 means ~100+ sales/day, full-time income. Bestseller-list books sit under rank 100.
Should I use main BSR or sub-category rank?
Use the main BSR (the rank against the whole Kindle Store or whole Books store) for this calculator — that's what the sales curve is calibrated against. Sub-category ranks ('#3 in Cozy Mysteries') are useful for marketing claims but don't map cleanly to sales/day.
Do Kindle and paperback BSRs estimate the same way?
The shape of the curve is similar, but volume differs. The Kindle Store sells far more units per day than the paperback Books store at the same rank, because the Kindle market is bigger. The calculator applies a format-specific multiplier (Kindle = 1.0, Books = 0.55, Audible = 0.7) to reflect this.
How can I improve my BSR?
BSR is a function of recent sales velocity — there's no trick beyond actually selling more copies. The fastest levers are: (1) more reviews to convert browsers, (2) Amazon Ads to drive paid traffic, and (3) a strong launch promotion (free or 99¢ for 5 days followed by a return to full price) to capture rank momentum.
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