Want to know exactly when your next period is due? Enter the first day of your last period and your usual cycle length, and the calculator predicts your next six period start dates — handy for planning travel, events, or trying to conceive. It also marks the ovulation day and likely PMS days in each cycle.
Enter your last period date and press Calculate to see your cycle predictions.
A doctor can discuss your symptoms and help you decide what to do next.
