How Amazon KDP Works: What Nobody Tells You Before You Publish

Most people find out how Amazon KDP works after they've already made a decision they can't easily undo. Let's fix that.

KDP stands for Kindle Direct Publishing. It's Amazon's self-publishing platform, and it lets any author upload a book — print or ebook — and sell it directly on Amazon without a traditional publisher involved. No agent required. No rejection letters. No waiting two years to see your book on a shelf. You upload the files, set your price, and Amazon handles the printing, delivery, and payment.

That's the simple version. The version that actually matters, the one that affects your royalties, your visibility, and whether your launch goes anywhere, has a few more moving parts. And the parts most first-time authors don't know about are the ones that tend to bite them.

If you're planning to publish on KDP and want to make sure the launch itself actually lands, The 5-Day Book Launch Kit by Arroe Murphy is worth looking at before you hit publish — but get the platform basics clear first, because they inform everything else.

The Two Things You're Actually Publishing: Print and Ebook

KDP handles both, and they work differently enough that it's worth treating them as separate decisions.

The ebook side is called Kindle Direct Publishing proper — your book gets converted into a Kindle format and sold as a digital download. Readers buy it, it downloads to their device or the Kindle app, and you earn a royalty. Simple enough.

The print side runs through KDP Print (previously called CreateSpace before Amazon absorbed it in 2018). This is print-on-demand, which means Amazon prints a physical copy only when someone orders one. There's no minimum print run. You don't pay upfront for 500 copies and hope they sell. Each book gets printed when it's bought, Amazon takes their cut for printing and distribution, and you get the rest.

Both versions live on the same Amazon product page, which is genuinely useful — a reader can choose between paperback and Kindle edition from the same listing without you having to manage two separate products. Getting both set up is worth doing even if you think most of your readers will go digital, because the paperback version often converts browsers who wouldn't commit to an ebook from an unknown author.

One thing that surprises a lot of new publishers: the two formats require different files. Your ebook needs to be formatted for reflowable text (Kindle's format shifts based on the reader's font size settings). Your print book needs a fixed-layout PDF with proper margins, bleed settings, and a spine width calculated from your page count. Submitting your ebook file as your print file is one of the most common — and most fixable — first-timer mistakes.

How Amazon KDP Royalties Actually Work

This is where people get confused, so let's be specific.

For ebooks, KDP offers two royalty tiers: 35% and 70%. The 70% rate sounds obviously better, and usually it is — but it only applies to books priced between $2.99 and $9.99 (or the local currency equivalent). Price your ebook below $2.99 or above $9.99 and you drop to the 35% rate. So a £0.99 ebook and a £12.99 ebook both earn you 35%, which is a detail that shapes a lot of pricing decisions.

For print books, the royalty calculation is different. KDP subtracts the printing cost from your list price first, then gives you 60% of what's left. Printing cost depends on page count, paper type (standard cream or white), and whether it's black-and-white or colour interior. A standard 250-page black-and-white paperback costs roughly $3.50 to print in the US market. Set your list price at $14.99 and your royalty is 60% of ($14.99 minus $3.50) — so about $6.89 per sale. Not bad. Set it at $8.99 and the maths get tight.

The mistake I see constantly: authors price their print book at whatever feels modest and then discover the royalty barely covers a cup of coffee. Run the numbers before you set the price, not after. KDP has a built-in royalty calculator in the dashboard — use it.

KDP Select: The Exclusivity Question Worth Thinking Through

When you publish an ebook on KDP, Amazon will ask whether you want to enrol in KDP Select. This is worth understanding before you click yes or no, because it comes with a trade-off that isn't always clearly explained.

KDP Select gives your ebook access to Kindle Unlimited (the subscription reading programme where readers pay a monthly fee and can read any enrolled book for free, with authors paid per page read) and a handful of promotional tools — free book days, Kindle Countdown Deals, and increased visibility in certain Amazon search placements.

The catch: KDP Select requires 90-day exclusivity. While you're enrolled, your ebook can only be sold through Amazon. No selling it on your own website, no listing it on Kobo, Apple Books, or Barnes & Noble. For some authors, especially those writing in genres where Kindle Unlimited readers are active (romance, fantasy, and thriller readers use it heavily), the income from page reads makes exclusivity worth it. For authors with audiences elsewhere, or those writing non-fiction with buyers who don't use Kindle Unlimited, it often isn't.

This isn't a decision with a universal right answer. It depends on your genre, your audience, and whether you want to be in the Amazon ecosystem fully or distribute wide. But it is a decision — not a default you should sleepwalk into.

What Amazon Does (And Doesn't Do) for Your Visibility

Here's the part that genuinely catches people off guard.

Amazon is not a marketing machine for your book. It's a search engine and a retailer. It will show your book to people who are already looking for something like it — if your keywords,

categories, and book description are set up correctly. What it won't do is actively promote your book to readers who've never heard of you, not unless you're paying for Amazon Ads or your book starts generating the kind of sales velocity that triggers organic algorithmic visibility.

The categories and keywords you choose during setup matter more than most first-time KDP authors realise. You get two categories and seven keyword slots. Those choices determine where your book appears in search results and browsing categories. A book filed under a vague, high-competition category with generic keywords will disappear into a list of 80,000 other titles. The same book filed under a more specific subcategory with well-researched keywords can show up on page one of a smaller but more relevant list.

Dave Chesson of Kindlepreneur has written extensively about KDP keyword research, and his data consistently shows that authors who spend time on category and keyword selection outsell equally good books that skipped the step. It's not glamorous work. But it's the difference between Amazon's algorithm working for you or ignoring you entirely.

The Launch Window — And Why It Matters More Than Most Authors Know

Amazon's algorithm pays close attention to a book's first few weeks. A book that generates consistent sales, reviews, and clicks in its early days gets treated very differently to one that trickles out a handful of copies over a month.

This is why the period immediately around your publish date isn't just a moment to celebrate — it's the window where your book either builds momentum or doesn't. Reviews matter here. So does getting real buyers (not just curious friends) to your page early. So does having a description that converts browsers into buyers, a cover that looks professional at thumbnail size, and a price that doesn't undercut your own credibility.

Getting all of this right before you hit publish — not after — is the difference between a launch and a publication date. This is exactly what The 5-Day Book Launch Kit is built around: giving first-time KDP authors a clear, day-by-day plan for the launch window so the algorithm actually works in their favour rather than passing them by. For anyone who's been treating "publish" as the finish line, that reframe is where the real work begins.

Before You Hit Publish: A Few Things to Get Right

A quick, honest checklist — not exhaustive, but the things that tend to matter most.

Your cover needs to work at thumbnail size. Most readers will see it as a small image in a search result, not a full-size display. If the title isn't readable at 150 pixels wide, the cover isn't doing its job. Hire a designer who understands Amazon book covers specifically, or use a template built for the format — general graphic design experience doesn't automatically translate.

Your book description is a sales page, not a synopsis. It should make someone want to read the book, not summarise what's in it. The first two sentences especially need to pull the reader in, because that's what shows before the "read more" cut-off on mobile.

Get your ISBN situation sorted. KDP offers a free ISBN, which is convenient but means Amazon is listed as the publisher of record. If that matters to you — for library submissions, for example, or for how the book appears in industry databases — buying your own ISBN through Bowker (in the US) or Nielsen (in the UK) gives you more control. For most indie authors publishing primarily through Amazon, the free ISBN is fine.

Amazon KDP is genuinely one of the more accessible publishing paths available to new authors. The platform itself isn't complicated once you understand the mechanics. What trips people up isn't the upload process — it's everything around it.

The pricing, the categories, the launch timing, the cover, the description. Get those right and the platform does what it's supposed to do.

If you want a step-by-step framework for the launch side specifically — what to do in the five days around your publish date to give your book the best possible start on KDP — The 5-Day Book Launch Kit by Arroe Murphy is where I'd point you. It's built for exactly this moment: the first-time author who understands the platform and now needs to know how to make the most of it.