It is a natural question, because a book with two or three reviews can feel untested to a browsing reader in a way that one with fifty does not. Reviews genuinely do offer social proof: they tell an undecided reader that other people bought the book and were willing to say something about it. That does not mean a low review count is, on its own, the reason a book is not selling, and it does not mean any particular number of reviews guarantees anything.
This guide looks at what reviews can and cannot reasonably be expected to do, sets out the ethical and policy-safe ways to gather more of them, and explains why a fixed review target is not a useful goal to chase.
What reviews can and cannot do
Reviews offer social proof: evidence, in the reader’s own words, that real people bought and read the book and had a reaction to it. For a reader weighing up an unfamiliar author against a known one, or comparing several similar-looking books, reviews can tip a close decision.
What reviews cannot do is compensate for a book that very few people are seeing in the first place, or fix a product page that does not convert interest once someone arrives. A book with plenty of reviews but very little traffic will still sell slowly, because sales require both discovery and persuasion, and reviews only support the second of those.
Why there is no fixed review target
It is tempting to look for a round number, ten, twenty, fifty, and treat it as a milestone that unlocks something. No such published threshold exists, and even where authors informally observe changes around certain review counts, this varies hugely by genre, price point, competition and the specific book, and cannot be relied on as a rule. Chasing a number as a goal in itself tends to distort effort away from the things that more reliably help: getting the book in front of the right readers and presenting it well when they arrive.
Other factors that may matter as much or more
Traffic, positioning and product presentation frequently matter just as much as review count, and sometimes more, because they determine whether a reader reaches the decision point at all, and whether the case made there is convincing. A strong cover, a clear description and accurate categorisation can support a purchase decision even with a modest number of reviews.
| Symptom | Reviews likely a factor? | Also worth checking |
|---|---|---|
| Very few people viewing the page at all | Unlikely to be the main factor | Discoverability, categories, keywords |
| Reasonable views, but hesitancy at the decision point | Possibly a contributing factor | Description, price, cover |
| Good reviews but still low traffic | Not the limiting factor | Discoverability, audience, marketing |
Reader trust
Reviews contribute to trust particularly for readers unfamiliar with an author, since there is no publisher reputation or existing readership to reassure them. This matters more for a debut than for an author with a following built through a website, mailing list or previous books, since trust can also come from those sources rather than review count alone.
Ethical review acquisition
There are legitimate, policy-safe ways to encourage honest reviews: mentioning at the end of the book that reviews help other readers find it, asking readers on a mailing list who have already finished the book, and using advance reader copies. What all of these share is that the reviewer reads (or has read) the book and writes their own honest opinion, with no exchange of payment, discount, free product beyond a genuine advance copy, or reciprocal review arrangement attached.
Amazon’s customer review guidelines set out what counts as acceptable and unacceptable review activity, including prohibitions on incentivised reviews and reviews from friends, family or anyone with a financial interest in the outcome. These rules apply regardless of intent, so it is worth checking them directly rather than relying on informal community advice about what "everyone does".
No review buying, swapping or incentivising
ARC readers after publication
Advance reader copies are usually discussed as a pre-launch tool, but there is nothing that limits them to that window. A small, targeted group of readers who genuinely read in the book’s genre can still be given an early or free copy after publication, in exchange for nothing beyond an honest review if they choose to leave one. This can be a reasonable way to add a handful of thoughtful early reviews to a book that has already been out for a while but has few reviews.
Example
Imagine a non-fiction author, six months after publication, reaching out to a dozen people in a relevant professional community, offering a free copy with no obligation beyond honesty if they felt like leaving a review. A few genuine reviews from people who actually work in that field can carry real weight for future readers browsing the same category.
What not to assume
Do
- Treat reviews as one contributing factor among traffic, positioning and presentation.
- Use transparent, policy-compliant methods such as ARCs and simple, honest requests.
- Check current Amazon customer review guidelines before relying on any specific method.
Avoid
- Chase a specific review count as a goal in itself.
- Pay for reviews, swap reviews reciprocally, or offer incentives for a positive review.
- Assume low reviews explain low sales without checking traffic and presentation first.
Common mistakes
- Chasing a review number instead of honest interest. There is no published threshold that unlocks anything; effort spent chasing a round number can crowd out more useful work.
- Assuming reviews alone explain low sales. Traffic and product presentation frequently matter as much, or more, than review count.
- Buying or swapping reviews. This breaks retailer policy and risks reviews being removed or the account being affected, regardless of good intentions.
- Only asking for reviews around launch. ARC-style requests can still work well after publication, particularly with readers genuinely interested in the subject or genre.
- Asking friends and family to leave reviews. Reviews from people with a personal connection to the author are treated differently by retailer policy and can be removed.
Frequently asked questions
How many reviews does a book need to sell well?
There is no published number. Amazon does not publish a review threshold, and any figure quoted elsewhere online is not an official rule.
Can I ask friends and family to review my book?
This is generally against retailer review guidelines when there is a personal or financial connection to the author; see Amazon’s customer review guidelines for the current position.
Is it fine to offer a free copy in exchange for a review?
A free advance copy, with no obligation to leave a review or to leave a positive one, is generally acceptable; offering a copy contingent on leaving a positive review is not.
Can I still run an ARC campaign after my book has been out for a while?
Yes. ARC-style outreach is not limited to pre-launch and can still add a handful of genuine reviews to a book that has already been out for some time.
Will more reviews improve my ranking on Amazon?
Amazon does not publish how reviews factor into ranking, and no reliable, documented formula exists. Reviews may support conversion, which can indirectly affect sales and, potentially, ranking, but this is not a guaranteed or direct mechanism.