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A book becomes a bestseller by ranking on a particular sales list or meeting a defined award threshold—not by crossing one universal number of copies sold. The label only tells you something useful when you know which list or award granted it, in which market and category, and when.
Why there is no single definition of “bestseller”
Different lists count different books, formats, retailers, markets, and time periods. A weekly ranking measures sales relative to competing books during a reporting window; a cumulative award recognizes sales past a fixed threshold. Those are distinct claims, even when both use the word “bestseller.” Publishers Weekly noted that differences among lists make it difficult to identify one definitive national bestseller across formats in a given week in its 2017 article, “Does Anybody Know What a Bestseller Is?”.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
|
Theo of Golden: A Novel | $12.99 | Buy on Amazon |
| 2 |
|
The Lost Bookshop: A most charming and uplifting novel, the perfect gift for book lovers! | $10.00 | Buy on Amazon |
| 3 |
|
Trust (Pulitzer Prize Winner) | $8.92 | Buy on Amazon |
| 4 |
|
Yesteryear: A GMA Book Club Pick: A Novel | $14.99 | Buy on Amazon |
| 5 |
|
The Silent Patient | $8.53 | Buy on Amazon |
As Bill Wolfsthal, then executive vice-president of sales and marketing at Skyhorse Publishing, put it in that article: “Every publisher must make a decision on when to refer to a book as a bestseller.” An unqualified label can therefore hide which standard was used.
How major bestseller systems differ
| System | What it measures | What the label does not establish |
|---|---|---|
| New York Times Best Sellers | The Times methodology search result describes completed transactions reported by vendors and end users during a period on or after a book’s official publication date. It says institutional, special-interest, group, or bulk purchases may be included at editors’ discretion under proprietary vetting and audit protocols. See The New York Times’ “About the Best Sellers”. | The accessible description does not provide a complete formula or a fixed copy threshold that guarantees placement. |
| Amazon Best Sellers Rank | A relative ranking based on customer activity in Amazon’s store. Amazon says ranks are updated at least daily, give more weight to recent activity, and can change as other books’ activity changes. Each format has its own rank; category rankings can combine formats. See Amazon KDP’s Sales Ranking documentation. | An exact unit-sales total, a reliable sales tracker, or a fair comparison between categories. |
| Publishers Weekly lists and print-sales data | Lists are divided by format and category, and their meaning depends on the data and formats included. In 2017, Publishers Weekly reported that BookScan tracked 80%–85% of U.S. print sales at that time and did not include e-book sales. | That 2017 coverage figure should not be read as a current estimate or as a measure of all formats. |
| Nielsen BookData UK Bestseller Awards | A cumulative-sales award scheme based on UK BookScan and PubTrack Digital data, with published thresholds and eligibility rules. See Nielsen BookData’s FAQ. | A general definition of bestseller status, or a threshold for the U.S. or another market. |
The New York Times: a list with proprietary rules
The Times methodology description says its lists use reported completed transactions and that some types of institutional or bulk purchases may be considered at editors’ discretion. Because its vetting and audit protocols are proprietary, it is not possible from that description to derive a guaranteed number of copies needed to make a list.
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Amazon: a changing rank, not a sales receipt
Amazon’s Best Sellers Rank compares customer activity with that of other books in its store. It changes with the activity of competing titles, not just with the book’s own performance. Amazon explicitly cautions that rank is not an accurate way to track a book’s activity or compare activity across categories. A strong category rank therefore means the book is ranking well in that Amazon category at that time; it does not establish a specific number of sales or equivalent status on the Times list.
Publishers Weekly and the limits of sales coverage
List coverage depends on which sales are counted. Publishers Weekly’s 2017 account discussed lists split by format and category and the complications introduced by e-books. It reported BookScan’s U.S. print-sales coverage as 80%–85% at that time, while noting that e-books were not included. That dated figure illustrates why the data source and formats matter; it is not a current coverage claim.
Rank #2
Nielsen BookData: UK thresholds for a specific award
Nielsen BookData’s FAQ, accessed in 2026, sets these thresholds for its UK Bestseller Awards:
- Silver: more than 250,000 copies.
- Gold: more than 500,000 copies.
- Platinum: more than 1,000,000 copies.
These figures refer to UK sales under that award scheme, not to bestseller status generally. The FAQ lists paperback, hardback, e-book, and qualifying film tie-in editions as covered. It excludes audiobooks, textbooks and manuals, free or remainder products, and materially different versions; some cases are assessed individually. Self-published books can qualify if they meet the criteria and Nielsen has verifiable data.
Rank #3
How many copies does a book need to sell?
There is no reliable universal answer. A list placement depends on its own rules, the category and format, the reporting period, and how other books are selling at the same time. The Nielsen thresholds above are the exception only in the sense that they are explicit numbers for one named UK award—not a general bestseller cutoff.
A 2018 study in EPJ Data Science, “Success in books: a big data approach to bestsellers,” examined New York Times hardcover fiction and nonfiction titles appearing between August 6, 2008, and March 10, 2016, using list data and NPD BookScan. In that historical sample, 26% of fiction titles appeared for one week, while 10 of 2,468 fiction titles remained on the list for more than a year. The study also found weekly sales varied by category and season, with late December and early January unusually elevated. These findings describe a past, limited sample; they do not set current sales requirements.
Rank #4
What to check when someone calls a book a bestseller
- List or award: Was it a New York Times list, an Amazon ranking, a Publishers Weekly list, or a named award?
- Market: Does the claim refer to U.S. sales, UK sales, or another country?
- Category and format: Was the book ranked overall or in a narrower category, and was the rank for print, e-book, or another format?
- Time frame: Was it a position on a weekly list, a rank observed on a particular date, or a cumulative award?
- Specificity: Does the wording say “No. 1” or “bestseller” without naming the list, category, and date?
“Bestseller” describes sales performance under a particular system. By itself, it does not prove literary quality, critical acclaim, or that a book sold widely across every retailer and format.
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