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.

Why Standard Book Sizes Matter

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

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:

- 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:

- 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:

- Width: 330mm
- Height: 225mm
- Depth: 40mm (including spine)
Comparing Standard Hardback Book Sizes


















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.