📅 Period & Ovulation Tracker

Estimate your next period, ovulation day, and fertile window.

These are statistical estimates based on average cycle length, not a medical diagnosis or guaranteed prediction — actual cycles can vary. Consult a doctor for fertility or health planning.

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📘 How to Use This Tool

Estimate your next period date, ovulation window, and fertile days based on your cycle history.

  1. Enter the first day of your last period.
  2. Enter your average cycle length in days.
  3. Click Calculate to see your estimated fertile window, ovulation day, and next expected period date.
  4. Update this each cycle for a more accurate ongoing estimate.

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