Choosing a book trim size
Trim size simply means the finished size of your book once the pages have been cut and bound together. It affects how the book feels in your hands, how easy it is to read, and how much it costs to produce. For most authors today, books are printed using print-on-demand services, which means choosing from a set of standard sizes rather than creating something custom. That might sound limiting at first, but in practice it makes decisions simpler and more reliable.
Common trim sizes you'll see most often
Certain book sizes are widely used because they work well for particular kinds of content. Novels and general nonfiction are most often printed at sizes like 5 × 8, 5.5 × 8.5, or 6 × 9, with longer books often using a slightly larger page so they don't become too thick. Larger formats, such as 7 × 10 or 8.5 × 11, are more common for workbooks, manuals, or books with diagrams and structured layouts. Illustrated books, children's books, and photography-led titles vary more, sometimes using square or landscape formats where images are the main focus.
Think about how readers will actually use the book
It helps to picture someone reading the book rather than thinking about measurements. Smaller books feel lighter and more portable, while larger pages allow for bigger text, more white space, and easier reading. A very thick book can feel intimidating, even if the content is excellent, whereas the same text spread over a slightly larger page can feel more approachable. Trim size also affects the overall mood of a book: compact sizes often feel intimate, while larger formats can feel more open or instructional.
How trim size affects cost
Trim size and page count go hand in hand. Smaller pages usually mean more pages, while larger pages reduce page count but use more paper per page. Both affect printing costs and, in turn, the price readers pay. The aim isn't to chase the cheapest option, but to find a sensible balance between comfort, appearance, and cost. We look at these factors together so the book feels right without pushing production costs higher than they need to be.
What print-on-demand services allow
Print-on-demand printers such as Amazon KDP and Ingram offer a wide range of standard sizes, but not every size works with every binding, paper type, or interior option. Landscape and unusual formats are more limited, and availability can change depending on how the book is produced. Trim size is therefore never chosen in isolation — it needs to work alongside paper, binding, and whether the book is printed in grayscale or color. We're very familiar with these options and make sure the size you choose will work smoothly all the way through to printing.
Choosing a trim size doesn't need to feel technical or overwhelming. It's really about picking something that suits your content, feels comfortable to read, and works reliably with modern printing. We help you think it through in plain terms, guiding you toward a size that looks good, reads well, and fits naturally with how your book will be produced.