To predict when your next period will arrive, track your menstrual cycle using a paper calendar, smartphone or online calculator, notes Mayo Clinic. Tracking menstrual cycles helps women learn about the regularity of their periods. It is also useful for women who are trying to conceive.
Women can include the following information when tracking their menstrual cycle: start date, end date, flow, pain, changes and abnormal bleeding, notes Mayo Clinic. Counting the days between periods will help determine the length of a woman's cycle. Another option is to enter the information in an online calculator, such as the one provided by Kotex, to automatically determine the dates of future periods.