The Hardcover Trim Sizes KDP Lists Right Now

KDP publishes hardcover trim sizes on its "Set Trim Size, Bleed, and Margins" help page. When I read it in September 2026, it showed five sizes. Every one of them shares the same page range, 75 to 550 pages.

The list is short compared with paperback. Several third-party size guides print longer hardcover lists that include sizes such as 6.69 x 9.61, 7.44 x 9.69 or 7.5 x 9.25, and those did not appear in the hardcover tables on KDP's own help pages. Amazon changes these tables without announcement, so confirm in the size dropdown of your own book before you commission a cover.

If you searched for the general paperback trim list, that one is longer and comes with its own margin and bleed rules. It is covered in KDP interior templates, and everything below stays on what changes when the format is hardcover.

Why the Hardcover List Is Shorter Than Paperback

Amazon does not publish a reason, so the following is inference from how the product is built. A KDP hardcover is a case-bound book: printed pages sewn or glued into a rigid board cover that is wrapped in a printed, laminated sheet. Each trim size needs its own cover boards, its own wrap dimensions and its own tooling on the printer's line. A paperback cover is a single flexible sheet, which is far cheaper to offer in many sizes.

The practical result is that the hardcover menu keeps the sizes that sell in volume and drops the long tail. If you have used the paperback dropdown, you will know the difference. Paperback carries sizes like 5 x 8 and 8.5 x 11 that hardcover does not carry.

Decide the format first. If your paperback is already live at 8.5 x 11, you cannot simply tick a hardcover box and reuse the same interior file.

Hardcover Against Paperback: The Specs That Actually Differ

Trim size is only one of the constraints. The table below collects the hardcover limits as KDP's help pages stated them in September 2026, next to what a seller should do about each one.

The inside margin depends on page count and grows as the book gets thicker. KDP's table starts at 0.375 in for books up to 150 pages, which covers the 100-page example below. For anything longer, read the row for your page count in KDP's margin table instead of relying on a fixed number.

Regular Trim or Large Trim, and What It Does to Printing Cost

KDP sorts trim sizes into regular and large. Large means wider than 6.12 inches or taller than 9 inches, and each class has its own per-page rate on the hardcover printing-cost page. On the hardcover list, 5.5 x 8.5 and 6 x 9 are regular. The other three, 6.14 x 9.21, 7 x 10 and 8.25 x 11, are large.

Here are the Amazon.com figures for black ink as I read them in September 2026. Books of 110 to 550 pages pay a fixed cost of $5.65 plus $0.012 per page in regular trim or $0.017 per page in large trim. Books of 75 to 108 pages pay only a flat fixed cost, $6.80 for regular and $7.49 for large. Prices and bands change, so check KDP's hardcover printing-cost page before you price.

That split hides a trap. The extra 0.14 inches of width on 6.14 x 9.21 pushes it into the large class, so a 300-page book costs $1.50 more to print than the same book at 6 x 9. If you are choosing between those two on looks alone, price both first.

The free KDP printing cost calculator models regular trim only, so for a large-trim hardcover, do the arithmetic yourself with the rates above. The formula is list price x royalty rate - printing cost. Take a $24.99 list price at 60 percent, which gives $14.99 before printing. An 8.25 x 11 book with 100 pages leaves $14.99 - $7.49 = $7.50, and a 6 x 9 book with the same page count leaves $14.99 - $6.80 = $8.19. Replace the 60 percent with the rate on KDP's royalty help page, since Amazon has changed its rates and low-price bands before.

How to Pick a Hardcover Size by Book Type

Size choice is a decision about who is holding the book and what sits on the page. The table is a starting point based on common conventions, not a rule from Amazon.

A hardcover is also a gift format. Gift buyers are likely to favor larger, image-heavy books, which is an assumption rather than data, but it is one reason the top end of the list deserves a look.

Worked Example: Turning an 8.5 x 11 Puzzle Book Into a Hardcover

Say you have a 100-page paperback puzzle book at 8.5 x 11 with symmetric 0.625-inch margins. You want a hardcover edition. The plan needs three checks.

• Page count: 100 pages is inside the 75 to 550 range, so the book qualifies.
• Trim: 8.5 x 11 is not on the hardcover list, so the target becomes 8.25 x 11. The width drops by 0.25 inches and the height stays put.
• Content area: at 8.5 inches wide, 0.625 in margins leave 8.5 minus 1.25, which is 7.25 inches. At 8.25 inches wide, the same margins leave 8.25 minus 1.25, which is 7.0 inches.

The method is a re-layout, not a resize. Keep the 0.625 in margins, rebuild each page for a 7.0 in content width, and re-check anything that touched the old margin against the outside-margin rule. Scaling the whole page does not work: shrinking 8.5 to 8.25 uniformly is a factor of about 0.97, which turns the 11 in height into roughly 10.68 in and leaves a 0.32 in gap. Squashing only the width distorts the grids instead.

The inside margin for a 100-page book falls in the 0.375 in row of KDP's table, so the 0.625 in margin already clears it. Confirm the value if your page count is different.

Assembly is where this plan gets awkward. If you build interiors from page images with a tool such as Octozia's KDP Creator, remember what it outputs: a ZIP of numbered 300-DPI PNG page images plus a manifest, not a finished PDF. Its trim options are 5 x 8, 5.5 x 8.5, 6 x 9 and 8.5 x 11, so 8.25 x 11 is not among them.

Those 8.5 x 11 PNGs cannot be dropped onto an 8.25 x 11 page without cropping or distortion. Generate a 6 x 9 or 5.5 x 8.5 book instead, since both sizes exist in both formats. Or accept a paperback-only 8.5 x 11 edition. Either route costs less than rebuilding every page by hand.

Cover Planning Before You Commit to a Size

A hardcover cover is a single wrap file, not the flat sheet you upload for a paperback. It contains the front, spine and back, plus extra material that folds around the board. The wrap, hinge and bleed dimensions differ from paperback, and the spine depends on page count and paper. The exact numbers come only from KDP's hardcover cover calculator, so do not size a cover from a blog post.

Running Paperback and Hardcover Together

KDP asks you to set up a hardcover as its own book entry on your Bookshelf rather than as an add-on to a live paperback. The two formats can be linked on the detail page, but they start as separate records with separate print settings.

Choosing 6 x 9 or 5.5 x 8.5 means the same trim exists in both formats, so the interior PDF is reusable and only the cover changes. Puzzle sellers working at 8.5 x 11 in paperback face two maintenance files, one at each width.

If you also sell through another printer, the size lists will differ again. The comparison at KDP vs IngramSpark covers the wider distribution trade-offs, and more background sits in the KDP publishing guides.

Mistakes That Cost Sellers Money Here

• Designing the cover before checking the dropdown. A cover made for 8.5 x 11 has to be rebuilt for 8.25 x 11, and a hardcover cover cannot be simply resized.
• Assuming a quarter inch does not matter. On a full-page puzzle or illustration it moves every edge element.
• Ignoring the class change. Going from 6 x 9 to 6.14 x 9.21 moves the book from $0.012 to $0.017 per page, so the margin you priced no longer holds.
• Padding to reach 75 pages. Blank or filler pages get reviews that mention them. Add real material or stay in paperback.
• Forgetting the price gap. Hardcovers cost more to print, and a list price that leaves a thin margin in paperback can leave nothing in hardcover. Run the list price x rate - printing cost line before you commit.

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