What are the standard KDP trim sizes?

Trim size You can choose from a variety of trim sizes (see the table below for a list of sizes, as well as minimum and maximum page count by size). The most common trim size for paperbacks in the U.S. is 6" x 9" (15.24 x 22.86 cm). When setting up your book, this is the default in the "Print Options" section of the Paperback Content tab. If you want a different trim size, click Select a different size and choose from standard and non-standard trim sizes. You can also enter your own custom trim size.