Period Forecast Calculator Period forecasters, calculators, and trackers are all programs that help you track and predict your menstrual cycle. Different types come with different bells and whistles, but all of them do the same basic thing: tell you when you can expect your next period.
Meet daysy – your personal fertility calculator. Daysy lets you make the choice! Daysy is a fertility monitor that uses the fertility awareness method (FAM) by learning & tracking your menstrual cycle. With daysy, you can plan or prevent pregnancy just as you choose. Daysy will show you if you are fertile or not with an accuracy of 99.3%. It is all natural and free of side effects.