Period Tracker
Track cycle health, predict fertility windows, and manage cycle patterns with accurate biometric projections.
Calculating your cycle...
Mode Strategic Insights
Select your tracking mode above to view tailored medical and biological guidance.
Track your data to see insights here.
Month Year
Next 4-Month Cycle Forecast
Biometric projection estimates for your next six cycles based on your current cycle profile.
| Cycle # | Period Start Date | Fertile Window | Peak Ovulation | Expected End |
|---|
How to Use This Tool
Follow these straightforward steps to track your monthly biological cycle with precision.
Configure Biometrics
Click the "Adjust Data" button or floating settings trigger to input the start date of your last period, standard cycle length, and period duration.
Select Tracking Intent
Switch between General health observation, Pregnancy Planning for conception timing, or Pregnancy Avoidance for natural family planning.
Monitor Insights & Forecast
Review the circular status dial for your real-time daily phase, explore the monthly calendar, and plan ahead with the 6-month predictive table.
Export Your Records
Download your comprehensive cycle projection directly as a validated JSON backup or save a clear, high-resolution JPG summary card.
Frequently Asked Questions
Ovulation typically occurs approximately 14 days prior to the start of your subsequent menstrual cycle. The tracker calculates this by subtracting 14 days from your projected next cycle start date, anchoring the biological luteal phase calculation.
The fertile window encompasses the five days leading up to ovulation plus ovulation day itself (a 6-day biological interval). Because sperm can survive inside the reproductive tract for up to 5 days, intercourse during this window carries the highest likelihood of conception.
Planning Mode highlights your peak fertility days, providing focused countdowns to your optimal conception window, tailored dietary suggestions (such as folate and micronutrient intake), and specific timing markers for intimacy.
Avoidance Mode implements calendar-based rhythm calculations to identify days with heightened pregnancy probability. However, natural cycle variations can occur due to stress, hormonal fluctuations, or lifestyle changes. It should be combined with barrier methods and secondary fertility indicators.
The indicator shifts between "Low", "Medium", and "Peak" based on biological proximity to ovulation. Days within 48 hours of ovulation indicate "Peak" probability, the outer fertile window registers "Medium", and post-ovulation luteal phases register "Low".
Yes. You can update your cycle length and duration anytime via the "Adjust Data" menu. For fluctuating intervals, using an average of your past three cycles offers the most reliable statistical prediction.
All cycle dates, logs, and biometrics are saved purely on your client device inside your browser's localStorage. No private health information is transmitted across remote servers or external networks.