Pregnancy due date calculator: When is your baby due

When is your baby due? Use this pregnancy calculator to find your due date based on the date of your last menstrual period, conception date, IVF three-day or five-day transfer date, or date of your last ultrasound. Calculate your due date, weeks pregnant, and birth probability using your last period, ultrasound, or known due date. Learn about the factors that influence your pregnancy length and the three trimesters. Wondering when your baby is due? Find out with our easy-to-use due date calculator, plus see your whole pregnancy timeline and what to expect this week. Our easy-to-use pregnancy calculator is the number one most popular way to calculate your due date based on the date of your last menstrual period or conception date, IVF transfer date, or the date of your last ultrasound.