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Estimate your next period and six upcoming starts from your own cycle interval.
Adults tracking natural menstrual cycles. Calendar models describe timing rather than fertility status.
Next period start = entered start + cycle length. Subsequent starts repeat that interval. Bleeding end = start + duration − 1. The calendar shows the entered start plus six future bleeding intervals, with six illustrative fertile-cycle models using next start − 14 days, center − 5 through + 1 and broader next start − 21 through − 9. These highlights are not exhaustive fertile dates or pregnancy-risk bounds. The final projected bleeding interval has no following fertility estimate. Icon fading is decorative, not a blood-flow prediction.
Enter your dates to explore your estimated cycle calendar.
Calculate to see your dates on a calendar, with clearly marked estimates and cycle details.
Calendar estimates cannot confirm ovulation or identify pregnancy-safe days. Changing your inputs clears the previous calendar.
