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Calendar estimates only — not a medical device. Cycles vary; consult a healthcare provider.
Fertile window
Oct 20 – Oct 26
Estimated ovulation
October 25, 2026
Next period (est.)
November 8, 2026
Current cycle
Calculated locally — your dates are never uploaded.
It is a calendar estimate (ovulation ≈ 14 days before next period). Cycles vary — not a medical device.
Use your average over several months if known; 28 days is a common default.
No — dates are processed only in your browser and are not uploaded.