on The Book Designer:

Book sizes vary depending on genre, audience, and a multitude of other factors. If you are self-publishing, it’s helpful to have a firm grasp of what your book size should be before you take your book to print. If you traditionally publish, knowing what size book to expect can be helpful as well.

While book sizes may seem like more of an aesthetic choice, consider the following ways your book size influences the context it is placed in:

• Whether it fits well in a backpack or purse
• How word count affects thickness
• How it lays on a coffee table
• Shelf space at bookstores

These factors may seem nonconsequential until further thought is put into them.

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