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Jul 03, 2026 RAW
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Standard Hardback Book Sizes in the UK

When it comes to publishing in the UK, understanding standard hardback book sizes is crucial for ensuring your book fits seamlessly into the market. This guide will walk you through the most common hardback book sizes in the UK, their uses, and why they matter.

the standard book sizes chart for children's books
the standard book sizes chart for children's books

Why Standard Book Sizes Matter

The Most Popular Trim Sizes for Self-Published Fiction & Nonfiction Books
The Most Popular Trim Sizes for Self-Published Fiction & Nonfiction Books

Standard book sizes serve several purposes. They dictate the type of paper and binding used, influence printing costs, and impact how books are displayed and stored. Understanding these sizes can help you make informed decisions about your book's format, design, and production.

Common Hardback Book Sizes in the UK

The Most Popular Standard Book Sizes - For the US & UK
The Most Popular Standard Book Sizes - For the US & UK

Royal

The Royal size is one of the most common hardback book sizes in the UK. It's often used for fiction and non-fiction books, as well as coffee table books. Here are its dimensions:

three books sitting side by side next to each other
three books sitting side by side next to each other
  • Width: 234mm
  • Height: 156mm
  • Depth: 30mm (including spine)

Demy

Demy is another popular size, particularly for non-fiction books, art books, and cookbooks. It's slightly larger than Royal. Here are its dimensions:

an image of different types of books labeled in the text book diagram below, with instructions on how to read them
an image of different types of books labeled in the text book diagram below, with instructions on how to read them
  • Width: 240mm
  • Height: 170mm
  • Depth: 35mm (including spine)

Folio

Folio is the largest of the common hardback book sizes in the UK. It's typically used for art books, coffee table books, and other books with large illustrations. Here are its dimensions:

the floor plan for a garage with measurements
the floor plan for a garage with measurements
  • Width: 330mm
  • Height: 225mm
  • Depth: 40mm (including spine)

Comparing Standard Hardback Book Sizes

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Multi Section Hardback Book
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48 Hour Books
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a person holding up a book with an image of a ring on it's cover
a diagram showing the layout of a bookcase with measurements for each section and how to measure it
a diagram showing the layout of a bookcase with measurements for each section and how to measure it
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Hard Cover Vertical Book Mock-Up by Yogurt86 | Creative Market
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several rows of books on shelves in a library
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a book with an image of a castle on it and the title once upon a time there was truth or why we need fairy tales jack zipes
Book Cover and Spine SVG - Regal Ornate Damask - Cricut HTV File for Bookbinding, Gold Foil Vinyl, Standard Book Size - Etsy
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Custom Hardback Book - Rebind Your Favorite Paperback - Etsy
Custom Hardback Book - Rebind Your Favorite Paperback - Etsy
two books sitting on top of each other
two books sitting on top of each other
four books stacked on top of each other in front of some pumpkins and leaves
four books stacked on top of each other in front of some pumpkins and leaves
Rebecca Yarros - Empyrean Trilogy (Iron Flame, Fourth Wing, Onyx Storm) - Deluxe Full Leather Bound Set
Rebecca Yarros - Empyrean Trilogy (Iron Flame, Fourth Wing, Onyx Storm) - Deluxe Full Leather Bound Set
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Old Bear Jane Hissey Collection of 3 Hardback Illustrated Books in Slipcase 1990s Three Book set
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The Stolen Heir Hardback Cover for Paperback Books - Hand Made Dust Jacket - Folk of the Air Series
many different colored books stacked on top of each other in front of a white background
many different colored books stacked on top of each other in front of a white background
Edgar Allan Poe: The Illustrated Anthology. Standard hardback
Edgar Allan Poe: The Illustrated Anthology. Standard hardback

Here's a table comparing the three most common hardback book sizes in the UK:

Size Width (mm) Height (mm) Depth (mm)
Royal 234 156 30
Demy 240 170 35
Folio 330 225 40

Understanding these sizes can help you choose the right format for your book, whether you're a self-publisher or working with a traditional publisher. It's also important to consider the content of your book - the number of pages, the type of paper, and the amount of text and images - when deciding on a size.

In the UK, standard book sizes are not strictly enforced, but they are widely used and expected by readers, booksellers, and printers. Using a non-standard size can make your book stand out, but it can also make it more difficult and expensive to produce and sell.

When in doubt, it's always a good idea to consult with a professional printer or publisher. They can provide advice based on your specific needs and help you choose the best hardback book size for your project.