Period Tracker

Log periods and predict your next cycle and fertile window.

Period start date:

Average cycle length (days): 28

⚠️ This is a personal log only — not medical advice, not a diagnosis. See a healthcare professional for any concern.

How to use

Log each period's start date and set your average cycle length. Predictions update automatically. Everything runs in your browser.

How are predictions made?

From your logged start dates and average cycle length — simple calendar math.

Is this medical advice?

No. It's an estimate aid only; cycles vary. See a doctor for concerns.

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