Ovulation Calculator

Ovulation is the release of a mature egg from your ovary, and it typically occurs about 14 days before your next period starts. For women with a 28-day cycle, this means ovulation happens around day 14. However, cycle lengths vary, and ovulation can occur anywhere from day 11 to day 21 depending on your individual cycle.

Your fertile window spans approximately 6 days — the 5 days before ovulation plus the day of ovulation itself. This is because sperm can survive in the reproductive tract for up to 5 days, while the egg is viable for only 12-24 hours after release. Having intercourse during this window maximizes your chances of conception.

Signs of ovulation include changes in cervical mucus (it becomes clear, slippery, and stretchy, similar to egg whites), a slight increase in basal body temperature, mild pelvic pain on one side (mittelschmerz), and increased libido. Ovulation predictor kits (OPKs) can detect the luteinizing hormone surge that precedes ovulation by 24-36 hours.