What Is KDP Select?
KDP Select is Amazon's exclusivity programme for eBooks. To enrol:
- Your eBook must not be available anywhere else in digital format (not on Kobo, Apple Books, Google Play, your own website, etc.)
- You commit to 90-day rolling terms (auto-renewing unless you opt out)
- In return: your book is available to Kindle Unlimited subscribers to read, and you get access to KDP promotional tools
When a KU subscriber reads your book, you earn KENP (Kindle Edition Normalised Page) payments instead of a direct sale royalty. A 300-page book read completely at $0.0045/page = approximately $1.35 per complete read. This is lower than a direct eBook sale royalty but the volume of reads in KU often compensates.
How KENP Income Works
KENP stands for Kindle Edition Normalised Pages. Amazon normalises all books to a standard page count — regardless of your actual page count, KDP calculates a KENP count based on word count and formatting.
KENP rate: Varies monthly based on the Global KDP Select Fund (Amazon allocates a set amount monthly) divided by total pages read across all KU books. The rate has historically been $0.0044–$0.0046 per page.
Your monthly KENP income calculation:
Pages in your book × KENP rate × number of complete reads = monthly estimate
A 350-page thriller at $0.0045/KENP earning 1,000 complete reads = $1,575/month from KU reads.
KENP reporting: Your KDP dashboard shows KENP read by day. You can track which titles are being read through and which readers are abandoning (important data for evaluating book quality and positioning).
Important: You earn KENP only on pages actually read, not the full book per borrow. A reader who downloads but doesn't open your book earns you nothing. A reader who reads 50% earns you 50% of the total KENP for that book.
Which Genres Thrive in Kindle Unlimited
KU is dominated by specific genres where readers consume books voraciously and read multiple titles per month:
Highest KU revenue genres:
- Romance (all sub-genres: contemporary, historical, paranormal, dark, clean)
- Fantasy (especially romantasy, urban fantasy, LitRPG)
- Science fiction (military sci-fi, space opera)
- Thriller / mystery (cozy mystery, domestic thriller)
- Horror
Lower KU performance genres:
- Literary fiction (readers more likely to buy than subscribe)
- Children's picture books (not well-suited to Kindle format)
- Business and professional books (corporate readers often buy rather than subscribe)
- Poetry (low page count, low KENP earnings)
The correlation: If your target reader is likely to read 2+ books per month in your genre and values access over ownership, KU is a natural fit. If your reader is a one-or-two-books-per-year person, they're less likely to be a KU subscriber.
Series Strategy for Maximum KU Income
KDP Select is most powerful in the context of a series. Here's why:
Read-through multiplier: A KU subscriber who loves book 1 will immediately read book 2, 3, 4... You earn KENP for each book they read. A 5-book series with average 350 pages per book = 1,750 KENP per subscriber who reads the whole series.
Book 1 as a funnel: Many successful KDP Select authors make book 1 free (Kindle Unlimited borrows = free reads for subscribers) or price it at $0.99. The goal is to get readers into the series funnel, then earn KENP revenue on all subsequent books.
Wide vs. series in KU: A standalone novel in KU earns KENP once per reader. A series earns KENP multiple times. The math strongly favours series fiction in KU.
Rapid release advantage: KU readers are habitual — they read daily. When you publish book 4 of your series, your existing KU readers read it within days of release. This creates launch-day KENP spikes that drive algorithmic visibility.
KDP Promotional Tools (Exclusive to KDP Select)
KDP Select includes two promotional tools:
Kindle Countdown Deals: Run a temporary discount on your eBook (starting from $0.99) while still earning the 70% royalty tier. Duration: 7 days maximum per 90-day enrolment period. Best used at launch or to re-energise a stalled backlist title.
Free Book Promotions: Make your eBook free for up to 5 days per 90-day enrolment period. Free promotions generate downloads but not direct income. Their value is: building readership for a series (free book 1 drives paid reads of books 2–5), generating reviews from new readers, and boosting your also-bought associations.
How to use them effectively:
- Countdown Deals: time with social media posts, email newsletters, or BookBub Featured Deals
- Free promos: submit to free book promotion sites (BookSirens, Freebooksy, Bknights on Fiverr) to maximise download volume
When Going Wide Beats KDP Select
Despite KU's advantages in fiction, going wide is the right choice in several situations:
Go wide if:
- Your book is non-fiction targeting a professional audience (Kobo and Apple Books are significant for professional books)
- Your readers are outside the US (KU penetration is lower internationally; Kobo is dominant in Canada)
- You write in a genre with low KU reader density (literary fiction, poetry, children's books)
- You want to reduce dependency on a single platform
- You write at a pace where KU momentum doesn't apply (one book per year or less)
The hybrid approach: Some authors run a book in KDP Select for 90 days at launch to maximise early algorithmic momentum, then go wide once the initial launch period ends. This gives you launch-period KU benefits without permanent exclusivity.
Wide distribution platforms: Draft2Digital distributes to Kobo, Apple Books, Barnes & Noble, OverDrive (libraries), Scribd, and more in a single upload. Smashwords (now part of Draft2Digital) covers similar ground.
Opting Out of KDP Select
If you decide to go wide or leave KDP Select:
1. Log into your KDP dashboard
2. Find your book under "Bookshelf"
3. Click "KDP Select Info" or the KDP Select enrolment section
4. Uncheck "Auto-enrol this book in KDP Select"
Important: You must opt out BEFORE your 90-day term expires. If you miss the window, your book auto-renews for another 90 days.
Once your term expires (and you've opted out), your book becomes available on other platforms. Your eBook must not appear elsewhere digitally until the term fully expires — check your KDP dashboard for the exact expiry date.
Books that violate exclusivity (appearing elsewhere during a KDP Select term) risk removal from the programme and potentially your KDP account.
Related How-Tos
Explore KDP Niches
Frequently Asked Questions
How much can you earn from Kindle Unlimited?
KENP earnings vary by book length and read-through rate. A romance author with a 5-book series averaging 350 pages, earning 500 complete series read-throughs per month at $0.0045/page, could earn approximately $3,938/month from KU alone — before direct sales. Results vary enormously based on genre, marketing, and release cadence.
Can print books be in KDP Select?
No. KDP Select exclusivity only applies to the eBook version. You can publish your paperback and hardcover anywhere — other retailers, IngramSpark, direct — while keeping your eBook exclusively in KDP Select.
Is Kindle Unlimited good for non-fiction authors?
Generally less so than for fiction. Non-fiction readers tend to buy books more than subscribe. Exceptions: self-help, diet/health, and finance books that attract habitual readers who may subscribe. Professional non-fiction (business, tech) skews toward paid purchases on devices other than Kindle.
What happens to my KENP earnings if I opt out of KDP Select?
Earned but unpaid KENP from your KDP Select period is still paid out on the normal 60-day payment schedule. Opting out stops future KENP accrual — you won't earn KENP on reads after your term expires.