How is menstrual cycle length calculated?
Count from the first day of full menstrual bleeding in one cycle up to (but not including) the first day of bleeding in the next cycle.
Predict your next menstrual cycle dates.
Forecasts future menstrual cycle start dates, expected period lengths, and PMS symptom windows based on historical cycle tracking data.
Next Period Date = Start Date of Last Period + Average Cycle Length (Days)
A standard healthy menstrual cycle averages 28 days, but normal clinical variation ranges from 21 to 35 days in adult females.
Inputs: Last Period Start = August 5 | Average Cycle Length = 29 Days | Bleeding Duration = 5 Days
Summary: Last Period = Aug 5 | Next Expected Period = Sept 3 | Following Cycle = Oct 2
Count from the first day of full menstrual bleeding in one cycle up to (but not including) the first day of bleeding in the next cycle.
A normal menstrual cycle in healthy adults ranges between 21 and 35 days; cycles under 21 days or over 35 days warrant medical review.
Common factors include emotional stress, rapid weight changes, thyroid disorders, polycystic ovary syndrome (PCOS), and perimenopause.