An Ovulation Calculator is a tool that helps individuals track their menstrual cycle to predict the most fertile days for conception. By inputting the start date of the last menstrual period and the average cycle length, the calculator estimates the ovulation date, which is typically around 14 days before the next period begins. This tool is useful for those trying to conceive, as it identifies the peak fertility window. Understanding ovulation can also assist in family planning and managing reproductive health. Many online calculators and mobile apps are available to simplify this process for users.