This tool estimates how far along a pregnancy is based on the measurement of the embryo or fetus from the top of the head (crown) to the bottom of the buttocks (rump). For example, if an ultrasound shows a measurement of 25mm, the calculator estimates the corresponding gestational age.
Accurate dating of a pregnancy is crucial for managing prenatal care, scheduling appropriate screening tests, and predicting an estimated due date. This methodology offers a relatively precise assessment, particularly during the first trimester when the correlation between size and age is strongest, offering increased confidence for both healthcare providers and expectant parents. Its use has become a standard practice in obstetrics, evolving from early manual measurements to sophisticated ultrasound technology providing improved accuracy.
