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Trim size is the most underrated production decision in self-publishing because it silently changes three things at once: how many pages your manuscript becomes, how much each copy costs to print, and how the book feels in a reader's hand. The same 90,000-word novel might run 260 pages at 6x9 or 300 pages at 5.5x8.5, and every extra page carries print cost. Genre convention matters too — fiction readers expect a portable 5x8 or 5.5x8.5, non-fiction and textbooks sit naturally at 6x9, and anything larger signals art, children's or reference books. This guide walks the trade-offs so you choose a trim that fits your genre, your budget and your content rather than defaulting to whatever template you found.
6x9, 5x8, 5.5x8.5, 8.5x11 — trim size shapes cost, page count, shelf presence and reader feel. A plain-English guide to picking the right size for your genre and budget.
5x8 and 5.5x8.5 dominate fiction because they are comfortable to hold and keep page counts (and print costs) moderate. 6x9 is the standard for non-fiction, memoirs and textbooks, fitting more words per page at a slightly higher print cost.
Yes, meaningfully. A larger trim fits more words per page — roughly 350-400 words at 6x9 versus about 300 at 5.5x8.5 — so the same manuscript makes fewer pages at the larger size. Fewer pages means lower print cost per copy.
You can, but each size is a separate edition needing its own print files, its own cover with different spine dimensions, and its own ISBN. Most authors pick one trim that fits the genre and stick with it.
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