A calendar ruler is a shape that can draw various types of calendars. By drawing only the necessary lines, it can be applied as a weekly/daily planner, meal plan, class timetable, etc. The calendar ruler 3 is made in a size that is good for using back paper. If you fold A4 paper twice and connect it with a calendar using wiring/card ring, it becomes a light and convenient diary. The wiring is enclosed in the package. You can draw both horizontal and vertical calendars. When drawing a vertical calendar, use the 7th (Mon-Sun) and 5th (5th) lines marked on the edge of the ruler.