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Standard Children’s Book Sizes
By AuthorWings editorial team
Updated
6 min read
Short answer
Self-published picture books are usually 8.5 × 8.5 inches (square) or 8 × 10 (portrait), with 8.5 × 11 for larger art. Early readers often use 6 × 9, chapter books 5 × 8 or 5.5 × 8.5, and middle grade and young adult 5.5 × 8.5 or 6 × 9. On KDP, a paperback can be no more than 8.5 inches wide.
The trim size is the finished size of the book’s pages, and for a children’s book it’s one of the first decisions to make: the art is drawn to it, the cover template depends on it, and not every size can be printed everywhere. This guide gives the standard sizes for each type of children’s book, shows them to scale, and explains what Amazon KDP and IngramSpark can print. If you want the whole book handled, see how to self publish a children’s book with us.
Standard children’s book sizes by type
Sizes are written width first, then height, in inches. These are the common choices for self-published books, checked against what KDP and IngramSpark print (as of October 2026). For royalties, distribution and print costs, see Amazon KDP vs IngramSpark for children’s books.
| Type | Common trim sizes | Shape | Why |
|---|---|---|---|
| Board book | About 5 × 5 to 7 × 7 | Square | Small hands; printed on thick board by an offset printer. See what a board book is |
| Picture book | 8.5 × 8.5, 8 × 10, 8.5 × 11; also 8.25 × 8.25 | Square or portrait | Big enough for full-spread art. See what a picture book is |
| Landscape picture book | 8.25 × 6 on KDP; 11 × 8.5 on IngramSpark (premium color only) | Landscape | Wide scenes and journeys |
| Early reader | 6 × 9 | Portrait | Room for large type and a picture on most pages |
| Chapter book | 5 × 8 or 5.5 × 8.5 | Portrait | Novel-like and easy to hold |
| Middle grade and young adult | 5.5 × 8.5 or 6 × 9 | Portrait | Standard trade paperback sizes |
Chapter book and novel interiors are mostly text, so they’re laid out like any novel; our book formatting covers those.
Children’s book sizes drawn to scale
Same scale, side by side
Children’s book sizes drawn to scale
Each card is drawn at the same scale (one grid square = 1 inch).
6 × 6 in
Board book
Board books: not on KDP or IngramSpark
8.5 × 8.5 in
Picture book, square
KDP and IngramSpark
8 × 10 in
Picture book, portrait
KDP and IngramSpark
8.5 × 11 in
Picture book, large
KDP and IngramSpark
8.25 × 6 in
Picture book, landscape
KDP only
11 × 8.5 in
Picture book, landscape
IngramSpark, premium color, up to 400 pages
6 × 9 in
Early reader, middle grade
KDP and IngramSpark
5.5 × 8.5 in
Chapter book, middle grade
KDP and IngramSpark
What KDP prints for children’s books
KDP lists 16 standard paperback trim sizes, and our guide to KDP trim sizes covers them all. A full-color 32-page picture book has to use premium color, because standard color starts at 72 pages. These are the KDP paperback sizes that suit children’s books.
| KDP paperback size | Suits | Premium color pages |
|---|---|---|
| 8.5 × 8.5 | Picture book, square | 24 to 590 |
| 8.25 × 8.25 | Picture book, square | 24 to 800 |
| 8 × 10 | Picture book, portrait | 24 to 828 |
| 8.5 × 11 | Picture book, large; activity book | 24 to 590 |
| 8.25 × 6 | Picture book, landscape | 24 to 800 |
| 6 × 9 | Early reader, middle grade | 24 to 828 |
| 5.5 × 8.5 | Chapter book, middle grade | 24 to 828 |
From KDP’s trim size, bleed and margins page, October 2026. KDP’s print options page also allows custom paperback sizes from 4 to 8.5 inches wide and 6 to 11.69 inches tall. That width limit is why the wide landscape sizes often quoted for picture books, such as 10 × 8 or 11 × 8.5, can’t be printed on KDP.
Every size needs its own files: the interior set to the trim size with bleed, and a cover from KDP’s template for that size and page count. Picture book formatting and book cover design are both set up for your exact trim size, and our publishing guide covers formatting the interior for print and ebook.
KDP hardcovers come in only five sizes and need at least 75 pages, so a standard 32-page picture book hardcover goes through IngramSpark; see how to self-publish a hardcover children’s book.
Square, portrait or landscape?
The shape changes how the art works, and on print on demand it also limits where you can print.
| Shape | Suits | Where it prints |
|---|---|---|
| Square (8.5 × 8.5, 8.25 × 8.25) | Concept books, bedtime stories, books for the youngest readers | 8.5 × 8.5 on KDP and IngramSpark; 8.25 × 8.25 on KDP (IngramSpark by custom trim) |
| Portrait (8 × 10, 8.5 × 11) | Character stories, tall scenes, non-fiction | KDP and IngramSpark |
| Landscape (8.25 × 6, 11 × 8.5) | Journeys, wide landscapes, chases across the spread | 8.25 × 6 on KDP only; 11 × 8.5 on IngramSpark (premium color only), not KDP |
Choose the shape before any final picture book illustration, because the art is painted to the page. For canvas sizes in pixels at each trim size, see how to illustrate a children’s book.
Sizes for a KDP paperback and an IngramSpark hardcover
A common setup is the paperback on KDP and the hardcover on IngramSpark. If you want the two editions to match, pick a size both print.
| Size | KDP paperback | IngramSpark hardcover (case laminate) |
|---|---|---|
| 8.5 × 8.5 | Yes | Yes |
| 8 × 10 | Yes | Yes |
| 8.5 × 11 | Yes | Yes |
| 8.25 × 8.25 | Yes | Custom trim only |
| 8 × 8 | Custom size only | Yes |
| 11 × 8.5 | No | Yes, premium color |
| 8.25 × 6 | Yes | No |
IngramSpark sizes from its trim size matrix (July 2025). 8.5 × 8.5, 8 × 10 and 8.5 × 11 are standard paperback sizes on both platforms, and IngramSpark also prints all three as case laminate hardcovers. KDP’s only hardcover size in this range is 8.25 × 11.
Board book sizes
Board books are usually small, often square, about 5 × 5 to 7 × 7 inches, printed on thick board. Neither KDP nor IngramSpark prints board books, so they need an offset printer and a print run. Our guide to board books covers sizes, page counts and printing.
When to get help
Picking the size is the first of many decisions that have to match: the art, the interior file, the cover template and the platform. At AuthorWings, picture book formatting costs $299 for print or $499 for print, ebook and hardcover editions, and publishing a 32-page picture book with your own art costs $1,542 in total, at our published prices (as of October 2026).
Children’s book publishing
The right size, set up for every store
We confirm the trim size before any art or layout, then format, design the cover and publish your book to the platforms that print that size.
- $1,542 Picture book with your art
- $499 Picture book formatting, all three editions
- $299 Print formatting only
Frequently asked questions
What size is a typical picture book?
Self-published picture books are often 8.5 × 8.5 inches (square) or 8 × 10 (portrait), and both are printed by KDP and IngramSpark. Traditionally published picture books vary more, because offset printers can make almost any size. Check the size against your printer before the art starts.
Can I print a landscape picture book on KDP?
Yes, but only up to 8.5 inches wide. KDP’s standard landscape size is 8.25 × 6, and custom sizes can be up to 8.5 inches wide and at least 6 inches tall. For a wider landscape book, such as 11 × 8.5, use IngramSpark, which prints it in premium color.
Do larger sizes cost more to print?
On KDP, sizes are grouped as regular or large, and large trim sizes cost more to print. Every common picture book size is a large trim, so the size rarely changes the cost; the page count and ink do. A 32-page picture book in premium color is the usual setup. Our guide to KDP printing costs shows example prices.
What size should a chapter book be?
Chapter books are usually 5 × 8 or 5.5 × 8.5 inches, the size of a short novel. They’re mostly text with spot art, so they print well in black ink, which costs less than color. Middle grade novels use 5.5 × 8.5 or 6 × 9.
Related reading
- How to publish a children’s book: the full route, from illustration to launch
- What is a picture book?: length, ages, format and its parts
- How to self-publish a hardcover children’s book: KDP or IngramSpark, sizes and pricing
AuthorWings editorial team
The AuthorWings editorial team writes and updates our guides for first-time authors. Every post is read and edited by a person on our team before it is published.
