Ovulation Calculator

Predict your most fertile days by entering the first day of your last period and your average cycle length. The calculator estimates your ovulation date and the fertile window — the days when conception is most likely. Ovulation typically occurs about 14 days before the start of your next period, but this varies with cycle length.

This tool is helpful for both trying to conceive and understanding your menstrual cycle better. For the most accurate results, track your cycle over several months to determine your average length. Keep in mind that this is an estimate — confirm with additional methods like ovulation predictor kits or basal body temperature tracking.