OvulationCalendar is a companion for any woman who either desires a pregnancy or wishes to prevent one. OvulationCalendar is an application that calculates the time of ovulation and generates your personal fertility calendar. Simply enter the length of your menstrual cycle and the date of your last period, and OvulationCalendar will calculate your fertile days. The results are presented as calendar showing your fertile and non-fertile periods in different colors. You are most fertile when you are ovulating, so knowing your time of ovulation will help you determine the best days to conceive. OvulationCalendar calculates the probability of conception based on your ovulation time and other factors such as lifespan of the egg and sperm; and shows you the days that are most promising for conception. The natural way to avoid unwanted pregnancy is to abstain from unprotected intercourse during your fertile days. The most fertile time is the day of ovulation and the day before it. OvulationCalendar calculates the fertile days taking into account possible variations in your menstrual cycle, helping you avoid an unwanted pregnancy.