For women trying to conceive, our free ovulation calendar is an interactive chart that tracks your menstrual cycle to identify ovulation and fertile days. Many women with irregular cycles, as well as some women with regular cycles, have a difficult time determining their ovulation day. Significantly increase your chances of conception by tracking your ovulation symptoms: Basal Body Temperature (BBT), menses, and cervical mucous. For women with regular cycles, an ovulation calculator can help determine when you are most likely to ovulate based on the date and length of your menstrual cycles. You can quickly calculate this value and add it to your ovulation calendar.