Calculate pregnancy dates from last period, gestational age, or date of conception. This calculator is based on the work of Dr. Frank A. Chervenak, a leading expert on fetal biometry and obstetrics. The most versatile pregnancy calculator . Instantly calculate gestational age or due date from any other reference point in the pregnancy. This app calculates exactly 280 days (40 weeks) from LMP to EDD, and accordingly for any date in between. Calculate your estimated due date and gestational age based on various methods, such as conception date, ultrasound, or last menstrual period. Learn about the accuracy and limitations of each method and the factors that affect the date of delivery.
