Ovulation Calculator

The Ovulation Calculator estimates your likely ovulation date, fertile window, and day of peak fertility based on your menstrual cycle. Because conception is most likely in the few days leading up to and including ovulation, knowing this window can support family planning or simply a better awareness of your reproductive rhythm.

To use it, enter the start date of your last menstrual period and your average cycle length in days. The tool then returns an estimated ovulation date, the surrounding fertile window, and the day on which fertility is expected to peak.

Important: these results are calculated from average cycle math and are estimates only. Individual cycles vary from month to month, so this tool is not a reliable method of contraception and is not a substitute for medical advice. Consult a qualified healthcare professional for personal guidance.