Knowing when you ovulate is one of the most useful pieces of information if you’re trying to conceive, since your fertile window is only open for a few days each cycle. Our pregnancy ovulation calculator estimates your ovulation date and fertile window based on your cycle length and the first day of your last period.
Cycle length varies from person to person, and even from month to month for the same person, so this estimate works best as a general guide rather than an exact prediction. Many people combine this with other signs — basal body temperature changes or ovulation predictor kits — for a more precise picture of their individual cycle.
Once you know your fertile window, our pregnancy conception calculator can help estimate a likely conception date, and our pregnancy due date calculator projects your expected delivery date once you’ve conceived.