The most accurate algorithm for fetal weight Fetal weight is an important indicator that pregnant women are concerned about, because underweight or overweight fetuses will have an impact on the health of the mother and baby. At present, the medical community has developed a variety of algorithms to calculate fetal weight, but which algorithm is the most accurate? This article will elaborate on it from four aspects. Option 1: Fetal weight calculation method based on ultrasound measurement Ultrasound measurement is currently the most commonly used clinical method to estimate fetal weight. This method uses an ultrasound probe to measure biological parameters such as the fetal head circumference, abdominal circumference, and femoral length, and then calculates the fetal weight based on the formula.