Track your fertile window and optimize your chances of conception
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An ovulation calculator gives a statistical estimate, not a guarantee. It predicts ovulation at about 14 days before your next expected period, which is accurate for many women with regular cycles. Individual cycles vary month to month, so treat the fertile window as a guide and combine it with physical signs like cervical mucus or ovulation tests.
If your cycles vary in length, use your shortest recent cycle as a starting point and expect a wider fertile window. Ovulation can shift significantly between cycles, so the calculator's estimate is less precise. Many women with irregular cycles use ovulation predictor kits alongside a calendar estimate to identify their most fertile days.
Once you are pregnant, professional ultrasound analysis can suggest a gender prediction as early as 6 weeks using Ramzi theory, and with higher confidence at 11-14 weeks using Nub theory. The 20-week anatomy scan is the standard confirmation point.
The Ovulation Calculator is provided for informational and entertainment purposes only. Results are not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or qualified healthcare provider with any questions regarding a medical condition.
Do not make health or medical decisions based on these results. Read our full medical disclaimer.
Once you conceive, expert ultrasound analysis can suggest your baby's gender from as early as 6 weeks — long before the 20-week anatomy scan.