Menstrual Cycle Tracker

Tracks menstrual cycle length, predicts next period, ovulation, and fertile window.

days
Typical length from day 1 to day 1 of next period.
days
How long bleeding typically lasts.
days
Usually 14 days; can vary 11-17 days.

Enter values and click Calculate to see results

References

  1. Menstruation in girls and adolescents: using the menstrual cycle as a vital sign. Pediatrics / ACOG (2015). Link