Menstrual Cycle Tracker
Enter your details below to predict upcoming period dates, estimate your ovulation day and fertile window, and see where you are in your current cycle.
Next 6 predicted periods
Upcoming events timeline
Privacy
All calculations happen inside your browser. No data is sent to any server — nothing leaves your device.
Frequently Asked Questions (FAQ)
How does this menstrual cycle tracker work?
Enter the first day of your last period, your average cycle length and your period length. The tool then predicts your next period dates, estimates your ovulation day and fertile window, and shows your current cycle day and phase.
How many future period dates does it predict?
It predicts the start dates of your next six periods based on your average cycle length.
What cycle phases does the tracker show?
It labels the current day of your cycle as Menstrual, Follicular, Ovulation or Luteal phase, based on the date relative to your last period and average cycle length.
Is my data stored anywhere?
No. All calculations happen inside your browser with JavaScript. No data is sent to any server and nothing leaves your device.