Maternity & Fertility Follicular & Luteal Cycle Estimation

Ovulation & Peak Fertile Window Calculator

Identify your peak fertile days, ovulation window, and optimal conception timing based on your menstrual cycle length.

Clinical Oversight: Dr. Aarthi, DNB, DGO, FRM — Fellowship in Reproductive Medicine & IVF Specialist
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Specialist Oversight

Dr. Aarthi, DNB, DGO, FRM

Fellowship in Reproductive Medicine & IVF Specialist

Every pregnancy is unique. Timely milestone tracking, blood pressure vigilance, and ultrasound scans ensure healthy mothers and safe deliveries.
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Clinical Basis

Ovulation typically occurs 14 days before the start of the next menstrual period (luteal phase). Sperm can survive in fertile cervical mucus for up to 5 days, while the egg is viable for 12–24 hours after release. The 6-day fertile window comprises the 5 days before ovulation plus ovulation day itself.

Reference Guidelines

  • Pre-Fertile Window: Follicular development underway. Low probability of conception.
  • Fertile Window (Days O-5 to O-1): High conception probability. Intercourse every 1–2 days during this window yields optimal pregnancy rates.
  • Peak Ovulation Day (O-Day): Maximum fertility day. Egg released from mature Graafian follicle.
  • Post-Ovulation Luteal Phase: Fertile window closed. Progesterone rise prepares the endometrium for embryo implantation.

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