Ovulation Calculator
Ovulation day
Nov 5, 2026
Fertile window
Oct 31, 2026 → Nov 6, 2026
Next period
Nov 20, 2026
Estimated due date (if conception)
Jul 29, 2027
Upcoming predicted periods
Nov 20, 2026
Dec 18, 2026
Jan 15, 2027
Feb 12, 2027
Mar 12, 2027
Apr 9, 2027
FAQ
Menstrual cycle and fertility
When do I ovulate?
Ovulation typically occurs about 14 days before the next period (luteal phase ≈ 14 days). For a 28-day cycle: day 14 from cycle start. Varies between women.
How long is the fertile window?
About 6 days: 5 before ovulation (sperm survive up to 5 days) plus ovulation day. The egg is fertile for ~12-24 hours.
When does ovulation happen?
Usually about fourteen days before the next period, because the luteal phase keeps a fairly steady length. On a twenty-eight day cycle that falls on the fourteenth day.
Does the estimate hold for everybody?
It is a statistical estimate built on regular cycles. Anyone with variable cycles, treatment under way or questions about their own fertility will get reliable answers only from their doctor.