due date calculator

A due date calculator estimates the expected delivery date of a baby based on information such as the first day of the last menstrual period (LMP), the conception date, ultrasound measurements, or IVF transfer date. Most calculators use the common method of adding 280 days (40 weeks) to the first day of your last menstrual period, assuming a typical 28-day cycle. More accurate methods include using the conception date (adding 266 days) or early ultrasound measurements. IVF transfer dates provide the most precise due date as the embryo transfer date is known exactly. Due dates are estimates and most babies are born between 37 and 42 weeks of pregnancy. These tools help in pregnancy planning and tracking progress.