An ovulation calendar, also known as a fertility calendar, is a tool used by individuals or couples to track and predict a woman’s fertile window. This window typically occurs around the midpoint of a woman’s menstrual cycle when ovulation takes place. By charting the start and end dates of menstrual cycles over several months, individuals can estimate when ovulation is likely to occur. Additionally, tracking basal body temperature, changes in cervical mucus, and using ovulation predictor kits can further refine predictions. Understanding fertility patterns can help couples trying to conceive increase their chances of success by timing intercourse during the most fertile days of the cycle. Conversely, for those seeking to avoid pregnancy, knowing the fertile window can aid in practicing contraception effectively. Ovulation calendars serve as valuable tools in family planning by providing insight into a woman’s reproductive cycle and optimizing the chances of achieving or avoiding pregnancy.