KDP trim size recommender
Publishing glossary
Trim size: the final dimensions of your printed book.
Trim size is the finished page width and height of a printed book after the block is cut.
Checked:
✓6x9 inches is the KDP standard✓Page count changes with trim size✓The cover must match the trim size
Choosing a trim size
Fiction usually uses 5x8 or 5.5x8.5, nonfiction and workbooks use 6x9 or larger. The trim size fixes the page dimensions for both interior and cover.
- Pick the size before formatting
- Changing size reflows the whole book
- Trim size sets the spine calculation
Getting the dimensions right
The book sizes tool lists KDP's accepted trim sizes with page counts, and the cover calculator derives the matching wrap from the size you choose.
FAQ
Frequently asked questions
What is the most common KDP trim size?
6x9 inches for nonfiction and novels, with 5.5x8.5 as a close second for fiction.
Can I change trim size after formatting?
You can, but every page reflows. Choose the size first, then format once.
Put the definition to work for free.
Run your manuscript through the matching free check and see how the term applies to your own book.