For the calendar pages, we offer gloss and matte options that are each 100lb text. Each is approximately 7 points in thickness, so fairly heavy for optimum opacity. In other words, you can’t see through them.
Alternatively, there is a 28lb page for a third price option. It is approximately 5 points in thickness.
The base for a complete calendar is 26 pages. That gives one page for each picture and month grid (24), plus a front and back cover.
Extra pages can be added for optional content. This may include a year grid of the next year or information about the artist/photographer/organization, and gives an opportunity to showcase a few more images.
There is no rule that your calendar starts in January and end in December, so the extra pages could include December of the current year and January of the following year.
For academic calendar printing, you may include months from September through to May (8 months) and use the remaining pages of the calendar to promote your club or information about your athletic program.