How to Choose KDP Categories: A Step-by-Step Method
A repeatable method for choosing your three KDP categories by relevance, buyer fit and competition, with a worked example and a ve…
The short answer
Publishing a book on Amazon KDP costs nothing upfront. There's no listing fee, no submission fee, and no charge for uploading a paperback or hardcover manuscript. Amazon doesn't take money from you to publish — instead, it deducts a per-unit printing cost from your royalty every time someone actually buys a copy.
So the real costs sit elsewhere: your own time and any tools you use to write, design and format the book; an optional ISBN; the proof copies you order to check your work before it goes live; and, if you want one, a subscription that speeds up cover or interior design.
How the printing-cost deduction actually works
For paperback, Amazon calculates your royalty per sale as:
Royalty = (royalty rate × list price) − printing cost
In the US, the royalty rate on Amazon's own sales channel is 50% for books listed at $9.98 or below, and 60% for books listed at $9.99 or above. Printing cost depends on page count and trim size:
| Trim size | 24–110 pages | Over 110 pages |
|---|---|---|
| Regular (up to 6.12" wide × 9" high) | $2.30 flat | $1.00 + $0.012 per page |
| Large (bigger than that) | $2.84 flat | $1.00 + $0.017 per page |
Example: a 200-page, 8.5×11 puzzle book falls in the large-trim category, so its printing cost is $1.00 + (200 × $0.017) = $4.40. Priced at $10.99, it sits in the 60% band, so list price × rate = $6.594. Subtract the $4.40 printing cost and your royalty is $2.19 per copy.
Trim the same book down to 110 pages and the printing cost drops to the flat $2.84, pushing your royalty up to $3.75 per copy at the same $10.99 list price. You can run your own page count and price through the KDP royalty calculator or the KDP printing cost calculator instead of doing the math by hand.
What you actually pay for
ISBN — optional
KDP gives you a free ISBN when you publish. You only need to buy your own if you specifically want to be listed as the publisher of record somewhere other than KDP — for most authors that's a choice, not a requirement.
Proof copies — print cost plus shipping
Ordering a proof copy isn't a sale, so no royalty math applies to it — you simply pay the printing cost plus shipping. Using the example above, a proof of that 120-page, 8.5×11 book costs you the $3.04 printing cost plus whatever shipping comes to at checkout for your address and order quantity. It's the closest thing to a real "publishing fee" that KDP has, and even that is optional — nothing forces you to order a proof before your book goes live, though doing it before you send anyone a buy link is worth the cost.
Your own time and tools
This is where most of the actual cost lives. Writing or generating the content, designing a cover, laying out the interior, and proofreading all take either your time or a subscription that buys some of it back. If you want software built specifically for KDP interiors, Book Bolt's Pro plan runs $23.99/mo ($19.99/mo billed annually) and Premium runs $35.99/mo ($29.99/mo billed annually); both include a cover-and-interior Studio designer, Product Search with BSR-derived sales estimates, cloud keyword data, and a Chrome extension called KDP Spy that overlays price, rank and review data onto Amazon's own search results. Premium's only real difference is more AI credits (4,000/mo vs. 1,000/mo), extra graphics packs, beta access and priority support. Both tiers offer a 3-day card-required trial. See our full Book Bolt comparison for the breakdown.
Octozia's own KDP Creator is built around the same interior-generation need, with seven generator types — sudoku, word search, maze, math, number-fill, crossword and word-scramble. It outputs a ZIP of numbered, 300-DPI PNG pages that you assemble into your interior yourself; it doesn't hand you a finished PDF. It's $9.99/mo, $99.99/yr, or $79.99 as a one-time lifetime purchase, also with a 3-day card-required trial. Full pricing for that and the rest of the lineup is on the pricing page.
Expanded Distribution: free to enroll, but it changes your math
If you enroll a paperback in Expanded Distribution, your royalty formula changes to a flat 40% of list price minus printing cost, instead of the 50%/60% Amazon-channel rate above. Enrollment itself is free. It extends your reach to bookstores, libraries and academic institutions through Amazon's US and UK distributors — but hardcovers aren't eligible, and enrolling doesn't guarantee any bookstore actually accepts or orders your title.
One thing that isn't a cost decision: "royalty plans"
If you've read that you need to pick a "royalty plan" for your paperback, that's a mix-up with Kindle ebooks, which really do have a 35%/70% royalty choice. Paperback doesn't work that way — your rate is set automatically by where your list price falls (at/below $9.98 vs. at/above $9.99) or by whether you've enrolled in Expanded Distribution. There's no dropdown for a different paperback rate.
What you won't find a price — or a number — on
Amazon doesn't publish a bestseller list with exact sales figures, and there's no per-title sales feed you can pay to unlock. The only public signal is Best Sellers Rank (BSR), which is a relative ranking, not a unit count — so any "X copies a day" number attached to a BSR is someone's estimate, not Amazon's data. Our BSR-to-sales calculator is built around that same limitation: it shows you the estimation method rather than pretending to hand you a guaranteed figure.
FAQ
Does Amazon charge anything just to list a book on KDP?
No. There's no listing fee or submission fee for paperback or hardcover publishing. Amazon only deducts a printing cost from your royalty when a copy actually sells.
Do I have to buy an ISBN?
No. KDP provides a free ISBN for your book. Buying your own is optional and mainly matters if you want to be listed as the publisher of record somewhere other than KDP.
Are proof copies required before I publish?
No, but they're the closest thing to a real cost KDP charges you directly. You pay the printing cost plus shipping for each proof you order, with no royalty involved since it isn't a sale.
Does enrolling in Expanded Distribution cost extra?
No, enrollment is free. It changes your royalty to a flat 40% of list price minus printing cost, applies to paperbacks only, and doesn't guarantee any bookstore or library actually orders your book.
Can I choose a higher royalty percentage for my paperback, the way I can with ebooks?
No. The 35%/70% royalty choice exists only for Kindle ebooks. Paperback rates are fixed by your list price band or by Expanded Distribution enrollment — there's no plan to select.
