Some book printers and publishers will ask that your book be setup so it is centered on an 8 1/2 x 11 sheet of paper. They will be printing your book out on a full sheet then trimming to your book size.
The form below will calculate what to set your margins to in order to center your book's layout on a larger sheet of paper and still maintain the formatting of the actual book size and its inner margins.
Fill out the size information for your book below in inches then press Calculate. You will be given the values to set your margins in your book's document to center them on the sheet of paper for the printer.