Does A+ Content Actually Increase Book Sales? What the Evidence Really Shows

Last reviewed by Robert Prime — 6 August 2026

Every article about Amazon A+ Content opens with a percentage. Twenty per cent. Eight per cent. 5.6 per cent. The numbers get repeated so often they feel like established fact, and almost nobody who repeats them has looked at where they came from.

We sell A+ Content design — £89 (about $120) for three panels, £149 (about $200) for five. So we have an obvious commercial reason to tell you the numbers are big and you should buy. That is exactly why this article does the opposite: it goes and checks.

What we found is that the answer has two halves, and most guides only tell you one of them.

The first half: every widely-quoted uplift figure for A+ Content traces back to Amazon’s own unpublished internal data, or to nothing at all. There is no public controlled study of A+ Content on books that we could find.

The second half: the mechanism is still real for books, and more real than for most physical products, because the Amazon book detail page is unusually poor at selling. That is an argument from structure, not from statistics — a weaker claim than “20% uplift”, and the only one we can actually stand behind.

This guide is about the evidence. If you want the step-by-step of building and submitting A+ Content, that lives in our separate guide to Amazon A+ Content for KDP.

What Amazon itself currently says

Amazon publishes exactly one public, checkable claim about A+ Content and sales. It sits on the US seller site at sell.amazon.com/tools/a-content, and as of 6 August 2026 it reads:

“Basic A+ Content can increase sales by up to 8%—and well-implemented Premium A+ Content can increase sales by up to 20%.”

Both figures carry a single footnote marker. The footnote says, in full: “Amazon internal data.”

That is the entire evidential basis. No sample size, no date range, no category breakdown, no methodology, no link to a study.

That page is also US-only. We could not find a UK equivalent — sell.amazon.co.uk/tools/a-content and /tools/a-plus-content both returned 404 on 6 August 2026. Amazon’s deeper Seller Central help articles on A+ Content sit behind a login wall. So the publicly verifiable Amazon claim is that one sentence.

Amazon makes a similar claim for its A/B testing tool. At sell.amazon.com/tools/manage-your-experiments, it says “Optimized content can help increase sales by up to 20%” — again footnoted to “Amazon internal data”.

Amazon’s own number has moved around

The figure has not been stable. Reporting by Ian Lamont at Lean Media (16 June 2024) tracked the same Amazon document across versions: a 2021 edition cited a 5.4% sales boost, a March 2023 edition of the Complete Guide to A+ Content for Brand Owners said A+ could “potentially increase sales by 8%”, and an August 2022 Premium A+ document claimed sellers could “increase sales up to 20% on average”. Lamont also quotes Amazon’s own caveat that results “may vary based on numerous factors including content quality, product price, and product category” and that the figure “is not a guarantee of future sales.”

We could not reach those original Amazon documents ourselves, so treat the version history as Lean Media’s reporting rather than as something we verified at source. The live 8%/20% wording on sell.amazon.com is ours, checked directly on 6 August 2026.

Every figure in circulation, and how strong it actually is

Of the seven figures in general circulation, two originate on Amazon’s own marketing pages, four are third parties reporting or restating them, and one has no origin we could find at all.

The row that matters most is the fourth. A flat “5.6%” appears in guide after guide, always as a bare number with no study behind it. SellerApp states only: “Amazon says A+ content can improve a product’s conversion rate by 5.6%.” Jungle Scout states only: “According to a study conducted by Amazon, the average conversion rate increase when utilizing an A+ Content description is 5.6%” (both checked 6 August 2026). Neither gives a sample size, a date range or a link to the study. We went looking for the original Amazon publication and could not find it anywhere we could reach.

We cannot see what Amazon has removed from its own site, so we are assuming rather than demonstrating that no such publication ever existed. What we can say is that anyone repeating the figure today, agencies charging money on the back of it included, is repeating a bare number they have not checked.

If a number cannot be traced to a source you can open, it is not a number. It is a rumour with a decimal point.

The four things wrong with “up to 8%”

Even taking Amazon’s figure at face value, four problems stop it being useful for an author deciding whether to spend £89.

Start with the phrasing. “Up to 8%” describes a ceiling. The mean could be 1%, the median could be zero, and the sentence would still be true as written. “Up to 8%” and “typically 8%” are completely different statements, and the second is what most guides silently print.

Then the subject. Amazon’s A+ claims sit on seller-side pages, alongside case studies about hardware and consumer goods. Books behave differently: lower price point, heavier reliance on cover and reviews, and a detail page laid out differently from a physical product page. Nothing in Amazon’s published material breaks the figure out for books.

Then the study design, or the absence of one. A brand that invests in A+ Content is usually a brand also investing in photography, ads, reviews and pricing. Comparing listings with A+ to listings without measures the kind of seller, not the effect of the panels. Unless Amazon randomised it — and nothing published says they did — the figure is correlational.

Finally, “well-implemented” is doing heavy lifting. The 20% Premium figure is conditioned on quality, which is unfalsifiable in practice: anything that underperforms can be reclassified after the fact as not well implemented.

Why the mechanism is still real for books

A physical product on Amazon arrives with seven or more images, a video slot, bullet points, and a specifications table. Enhanced content adds to something already rich. A book arrives with almost nothing.

Those description limits are Amazon’s own. KDP’s help page on writing a book description states plainly: “we have a limit of 4000 characters for the description”, and confirms that “the text editor will count all characters used, including any HTML tags” — so bolding a single word costs you 11 characters instead of 4. Amazon’s own advice on that page is to aim “for a 150-word paragraph with sentences that are easy to scan.”

So the realistic state of a self-published book page is one image, roughly 150 to 400 visible words, and a “Read more” link — and that is the whole of the sales pitch.

A+ Content is the only mechanism Amazon gives an author to put a second image on that page. KDP’s A+ Content examples page confirms “you can choose between 17 modules to design your detail page layout” and that “You can use up to five modules per detail page layout”. The content appears under the “From the Publisher” heading — and KDP notes that “the exact location varies, most readers will need to scroll to view the content.”

That last clause is important and rarely quoted. A+ Content is below the fold. It is not a headline. It works on the reader who has already scrolled — someone in the consideration stage, not someone skimming search results.

Which narrows the claim to this: A+ Content cannot make anyone click into your book. It can only help convert a reader who is already on the page and undecided. If your problem is that nobody reaches the page, A+ Content is the wrong purchase.

We are not going to hand you our own percentage either

It would be easy to close this gap by spot-counting a few dozen book listings ourselves and reporting the share that carry A+ Content. We considered it and decided not to publish such a number.

A single-day, single-marketplace, hand-classified count of a few dozen listings is not something you could reproduce, and this article’s entire argument is that a number you cannot reproduce should not be repeated. Publishing our own unreproducible count to replace the ones we have just criticised would be the exact mistake the piece is about. So we are not going to dress a five-minute browse up as a statistic.

What we can say without a spreadsheet is structural, and it is the more honest claim: the argument for A+ Content on a book does not rest on any uplift percentage at all. It rests on the page. A book detail page is unusually thin — one image and a capped description — and A+ Content is the only mechanism Amazon gives you to add anything to it. That is verifiable by anyone in a browser, and it does not need a number to be true.

The problem you will hit if you try to measure it yourself

Here is the part almost no guide mentions, and it is the single biggest reason reliable data on books does not exist.

KDP authors cannot A/B test their listings. Amazon’s Manage Your Experiments tool is a seller-side feature requiring a Professional selling account and a Brand Representative role for a brand enrolled in Amazon Brand Registry. The Manage Your Experiments page lists both as eligibility requirements, live on 6 August 2026. A standard KDP author publishing under their own name has neither. KDP’s own help pages describe A+ Content and its 17 modules but make no mention of Premium A+ or of split testing.

KDP authors also get no page-view data. Sellers see sessions, unit session percentage and conversion rate. KDP reports give you orders, pages read and royalties. No sessions. So you cannot even calculate a conversion rate from your own dashboard.

Which means the before-and-after comparison most authors run — “I added A+ Content and my sales went up” — has no control group, no traffic denominator, and usually coincides with the author also doing three other marketing things that week. That is an anecdote, not a measurement.

What an author can actually measure, ranked by how much it tells you:

If you run Amazon Ads, your advertising reports give you impressions, clicks and orders, and clicks divided into orders is a conversion rate on a consistent traffic source. Hold your bids and targeting steady, note the date your A+ Content goes live, and compare a fortnight of ad conversion rate before against a fortnight after. It is still not a controlled experiment — the auction shifts, and your competitors change their pages too — but it is the only measurement available to an author that has a denominator in it. Our guide to Amazon ads for authors covers the setup.

One caveat on timing: KDP states that compliant A+ Content “will appear on your detail page within eight business days”, and that the timeline can extend during busy periods. Do not start your before-and-after clock on the day you submit.

So should you pay for it?

The evidence supports a modest, specific recommendation, not a big one.

Do it if your book already gets meaningful traffic — from ads, a mailing list, a series backlist, press, or a category position that is generating clicks. A+ Content converts existing attention. If attention exists, the panels have something to work on.

Do not do it yet if your book is getting a handful of clicks a week. An 8% lift on eight visitors a month is nothing. Money spent on the cover, the categories, the keywords or a small ad budget will do more, and our guides on KDP keyword research and book cover design are free. Fix the traffic problem first. A conversion tool cannot solve a traffic problem.

Do it yourself if you are reasonably competent in Canva and have decent source material — author photo, series artwork, a few quotable review lines. Amazon’s A+ Content Manager is free and the module templates do the layout for you. The KDP A+ Content Guidelines are strict but short: no pricing, discounts or promotional language such as “free” or “buy now”; no customer reviews; no competitor comparisons, “regardless of how competitors are mentioned”; no time-sensitive words like “new” or “on sale now”; no awards “received more than 2 years ago”; “a maximum of four quotes or endorsements”; and images as JPG or PNG in RGB, each “under 2 MB”. A careful author with an afternoon can produce something respectable.

Here is the cost landscape, checked live on 6 August 2026. Dollar conversions are indicative only, at roughly £1 = $1.35 (August 2026); the rate moves, so treat every dollar figure below as approximate.

We are not an affiliate for anything on that list. We do not take a cut if you go to Fiverr, and we make nothing if you do it yourself. That is precisely why we can say the DIY row is a real option, which reviewers running affiliate links generally cannot.

The arithmetic, on one stated assumption

A+ Content is a fixed cost against an unknown, probably small, permanent percentage. So run it as a payback calculation, and state the assumption out loud so you can argue with it.

Assume Amazon’s own 8%. That is generous — it is a ceiling, not an average — but it is the only figure Amazon publishes, so it gives you a best case. At £89 on a £2.99 ebook earning roughly £2 a copy in royalty, you need about 45 extra sales, ever, to break even.

Now halve the assumption to 4%, which is probably closer to reality given how “up to” works, and those become roughly four and a half years, eleven months, and under four months respectively.

The shape of the answer does not change. At 20 copies a month it never really pays. At 300 it pays quickly and keeps paying, because the cost is one-off and the lift, whatever it is, is permanent. Somewhere around 100 copies a month is where it stops being a gamble and starts being obvious — and that is precisely the number to recalculate with your own royalty rate rather than take from us. Run your own arithmetic before you run anyone’s percentage.

What good A+ Content for a book has to do

Briefly, because this is not a how-to guide and the setup walkthrough is elsewhere.

Since A+ sits below the fold and only reaches readers who are already scrolling, the job is narrow: answer the specific objection that stops an undecided reader buying. For fiction that is usually “is this the kind of book I like?” — so comparison titles, tone, and where it sits in a series. For non-fiction it is “will this actually help me?” — so a contents overview, credentials, and who the book is not for.

A comparison-chart module listing your series in reading order is the highest-value single panel most authors can build, because it answers a question the standard detail page cannot.

One thing not to buy A+ Content for: search. We could not find a current, public Amazon statement on whether A+ Content text is indexed for Amazon search, and seller forum answers contradict each other. Treat any confident claim in either direction as unverified.

If you want a free second opinion on whether your listing is ready for any of this, our free KDP readiness audit checks the page-level basics first.

The bottom line

The commonly-quoted uplift numbers for A+ Content are poorly sourced. Amazon’s own “up to 8%” and “up to 20%” are marketing figures footnoted to internal data that has never been published. The bare “5.6%” figure repeated across the industry has no primary source we could trace. There is no public controlled study of A+ Content on books, and KDP authors cannot run one themselves because Amazon’s split-testing tool is not available to them.

The mechanism, though, is real — and more real for books than for the products Amazon’s figures were probably drawn from, because the book detail page is genuinely thin: one image, a 4,000-character description, and a “Read more” link. A+ Content is the only way to add anything to it.

That structural fact is the actual argument, and it is a better one than a percentage nobody can source. It does not depend on a study, on Amazon’s marketing, or on a spot-count we cannot ask you to reproduce. Whether it is worth £89 to you is a payback calculation, not a belief — and you now have the arithmetic to run it.

Related guides

• Amazon A+ Content for KDP: How to Set It Up
• Amazon Ads for Authors
• KDP Keyword Research
• Book Launch Checklist
• Self-Publishing Costs UK

Frequently asked questions

Does A+ Content increase book sales?

There is no published controlled study proving it does for books. Amazon states on sell.amazon.com/tools/a-content that Basic A+ Content “can increase sales by up to 8%”, footnoted only to “Amazon internal data” with no methodology given. The mechanism is plausible for books because the standard Amazon book page offers just one image and a 4,000-character description, so A+ Content is the only way to add anything visual — but treat any specific percentage you see quoted as unsourced.

Is the “5.6%” A+ Content statistic real?

It circulates as a bare number with no study attached. Blogs such as SellerApp and Jungle Scout (both checked 6 August 2026) quote a flat 5.6% conversion-rate increase attributed only to “Amazon” or “a study conducted by Amazon” — no sample size, no date range, no link. We searched for the original Amazon publication and could not find it. We cannot see what Amazon may have removed from its own site, so we cannot say the study never existed — only that nobody repeating the figure today appears to have checked it, and nor should you accept it from anyone charging you money on the strength of it.

Where does A+ Content appear on a book’s page?

Under the “From the Publisher” heading, below the fold. KDP’s own A+ Content examples page states the content “is located under the From the Publisher section” and that “while the exact location varies, most readers will need to scroll to view the content.” That placement is the whole reason A+ Content is a conversion tool and not a discovery tool: it only reaches a reader who has already landed on your page and started scrolling. If nobody is reaching your page, A+ Content is the wrong purchase.

Can I A/B test A+ Content on my book?

Not through Amazon if you publish via KDP. Amazon’s Manage Your Experiments tool requires a Professional selling account and a Brand Representative role for a brand enrolled in Brand Registry, which standard KDP authors do not have. The closest workaround is to hold your Amazon Ads bids and targeting steady and compare ad conversion rate — clicks divided into orders — for a fortnight before and a fortnight after your A+ Content goes live.

How much should I pay for A+ Content?

Anywhere from nothing to a few hundred pounds, depending on how much traffic your book already gets. Amazon’s A+ Content Manager is free and DIY is a genuinely viable route if you can use Canva. Freelance gigs on Fiverr range from a few pounds for a template fill to a few hundred for a top-rated seller — a huge quality spread, and prices that move constantly, so treat any figure as a snapshot rather than a fixed rate; our own A+ Essentials is £89 (about $120) for three panels. On a £2.99 ebook earning about £2 a copy, £89 needs roughly 45 extra sales to break even — which at Amazon’s own 8% figure takes about 28 months for a book selling 20 copies a month, and under two months for one selling 300.

How long does A+ Content take to appear on my book page?

KDP states that content complying with its A+ Content Guidelines “will appear on your detail page within eight business days”, and that the timeline may extend during periods of high volume. This matters if you are trying to measure the effect: start your before-and-after comparison from the date it actually goes live, not the date you submitted it.

Does A+ Content help my book rank in Amazon search?

We could not find a current, public Amazon statement either way, and seller forum answers contradict each other. Buy A+ Content as a conversion tool for readers who are already on your page, not as a ranking tool. If search visibility is your problem, keyword and category work will move the needle and A+ Content will not.