Track your most fertile days to increase your chances of getting pregnant.
Please select the first day of your most recent period
This calculator estimates your fertile window based on your menstrual cycle. Ovulation typically occurs 12-14 days before your next period.
Enter the first day of your last menstrual period above to get started.
Ovulation is the release of an egg from one of your ovaries. It typically occurs about 12-14 days before your next period starts. The egg can only be fertilized for 12-24 hours after its release.
Your fertile window includes the 5 days before ovulation and the day of ovulation itself. This is because sperm can live in the female reproductive tract for up to 5 days, while an egg lives for only about 24 hours after ovulation.
Tracking your ovulation can help you identify your most fertile days, which is useful whether you're trying to conceive or avoid pregnancy. Remember that this calculator provides estimates based on average cycle patterns - your actual ovulation may vary.