An online pregnancy calculator is a convenient tool designed to estimate important milestones and due dates during pregnancy based on the first day of a woman’s last menstrual period (LMP). By inputting this date, along with the typical length of her menstrual cycle, the calculator can predict the expected due date (EDD) and provide insights into key stages of fetal development. This tool helps expectant parents track their pregnancy progress and plan accordingly for prenatal care and preparations for the arrival of their baby.