You just discovered you are pregnant. The first question everyone asks: "When is the baby due?" You know the date of your last menstrual period, but calculating the due date manually requires knowing pregnancy formulas and counting weeks. You could count weeks on a calendar manually. You would need to add 280 days to your last period. Then count forward day by day. Or you could use a due date calculator to instantly show your estimated due date is March 15th based on your last menstrual period being December 8th. A due date calculator estimates your baby's expected arrival date based on your last menstrual period or conception date, calculating approximately 280 days forward. Due date calculators are used by pregnant women tracking their pregnancy, healthcare providers scheduling appointments, midwives planning care, partners preparing for baby's arrival, and anyone wanting to understand pregnancy timeline. In this comprehensive guide, we will explore what due date ca...