Period & Fertility Tracker
Predict your next period, ovulation days, and fertile window with precise AI-driven cycle analysis.
Configuration
Health data is sensitive. This calculator runs entirely in your Browser’s RAM. No data is ever stored on any server.
Next Period Starts
Select Date
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Peak Fertility
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Estimated Ovulation
Your Cycle Roadmap
Fertility Insight
The fertile window is the 5-day period including ovulation when conception is most likely.
Understanding Your Menstrual Health with AI
Tracking your menstrual cycle is about more than just predicting your next period. It’s a vital sign of your overall health. Our **Cycle Lab Tracker** helps you understand the four phases of your cycle, from menstruation to the luteal phase, giving you the power to plan your life with confidence.
Accurate Ovulation Prediction
By analyzing your average cycle length, we calculate your most fertile days. This is essential for anyone trying to conceive or simply wanting to understand their hormonal shifts.
Zero-Data Logging
Unlike many mobile apps that sell your health data to advertisers, Cycle Lab is 100% private. All calculations happen in your browser and vanish as soon as you close the tab.