Fertility Calendar is a simple and intuitive application for calculating and predicting the fertile days of the month. It is helpful for couples wanting to get married and women trying to get pregnant. The application can calculate the fertile days of the month based on the following criteria: the date of the last menstrual period, the length of the luteal phase, the length of the menstrual period, and the age of the user. The application is effortless to use, with a simple and intuitive interface. It has a series of graphs and charts that make the calculations easier to understand.