Simple Ultrasound Fetal Weight Calculator

During your pregnancy, you will have to undergo one or more ultrasound examinations to check fetal development. One of the important measurements is the fetal weight estimate which can help healthcare professionals assess how well a fetus is growing. Our fetal weight calculator makes it easier for parents to find out for themselves their baby’s possible size.

Biparietal Diameter: mm
Abdominal Circumference: mm

Prenatal visits are extremely important throughout a woman’s pregnancy as it will help monitor both the mother’s and the baby’s health. Ultrasound examinations are performed to assess fetal development through several measurements. One of the most important is the fetal weight estimate. The size of the fetus can indicate how well he or she is growing. A fetus that is too small may mean that there is a problem with the placenta while a larger than normal fetus may indicate that the mother has gestational diabetes.

There are several ways to measure or estimate fetal weight. Healthcare professionals sometimes use the traditional method. They place their hands on your abdomen and feel the fetus. This is not very accurate though as there are many factors that can affect this type of examination. The uterus thickness, the amount of amniotic fluid, and the placenta’s size are just some of them.

Another method for estimating fetal weight is to undergo an ultrasound. During the examination, measurements of the head circumference, the biparietal diameter, the abdominal circumference, and femur length are often used to calculate the weight. There are several mathematical formulas used to calculate the estimated fetal weight. Some fetal weight calculators use all four measurements while our fetal weight calculator only makes use of two. It must be noted, however, that, like the traditional method, using an ultrasound examination to estimate fetal size is also not 100% accurate. Around 10% of the estimates done are wrong. And there is a 15% margin of error in even the best fetal weight calculators. Thus, it is important to also take into account the size of the babies born in your family as well as you and your spouse’s size.

While accuracy cannot be 100%, our fetal weight calculator does allow you to get an idea of how much your baby has grown especially if you have undergone an ultrasound examination or two in the past. If the results should concern you in any way, its best to discuss them with your doctor.

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