Abdominal Circumference Calculator

The biggest worry of a pregnant woman is how well her baby is growing. Ai??One way to find out fetal growth is measuring the abdominal circumference. Ai??While your doctor will be able to tell you whether or not your baby’s growth is normal, it always gives a mother additional comfort when she can verify the information herself. And what better way to do that than by using our abdominal circumference calculator? Input your baby’s measurement and find out how well your baby is doing compared to the growth of other babies in the baby percentile graph.

Week: Abdominal Circumference (mm):


Abdominal Circumference (AC) is one of the important measurements that is done during your ultrasound. The information is used in several ways. It can be used in calculating gestational age but it is a more accurate predictor for determining a fetus’ weight, particularly during the second trimester. Doctors also use the AC to find out whether your baby has normal fetal proportions. Measuring the abdomen is done at the level of the liver and stomach, and includes the umbilical cord’s left portal vein.

If you’re having your ultrasound done by a technician and not your doctor, it’s best to use this calculator first to find out how your baby’s AC measurement fares compared to the norm before going into a panic. An AC measurement that is above the 5th percentile Ai??in the fetus growth chartAi??is generally believed to be ok. Babies who are at the 5th percentile may need to be monitored a bit to see his or her rate of development over time. A baby with an abdominal circumference measurement below the 5th percentile, coupled with a fetal weight that is below the 10th percentile, is considered to be small for gestational age which can be a cause for concern because he or she may haveAi??intrauterine growth restriction. Ai??This means that your baby appears smaller than is expected and may not be getting the nutrition he or she needs to grow properly. There are also several other reasons why your baby’s much smaller than what your doctor believes he or she should be. It could simply mean that the dates are wrong (you’re actually at an earlier stage of your pregnancy) or that you yourself are small. Ai??It’s best to consult with your doctor and schedule a repeat scan in about 2 weeks’ time to see if there are any changes in the rate of your baby’s development.

What about babies with a really high AC measurement? Babies that have a greater than 90th percentile abdominal circumferenceAi??in the fetus growth chartAi??could indicate that they are getting more sugar in their diet than they need which means that the mother may have gestational diabetes. Or, you simply may be giving birth to a large baby because your family members are large people. To find out which one is the true cause, your doctor may require you to take another ultrasound in a couple of weeks as well as a glucose tolerance test to find out if you have gestational diabetes. Ai??You don’t need to worry overly much though because a healthy diet is usually all it takes to deal with something like this.

Now, while ultrasounds are great for seeing how well your baby is faring inside of you, it shouldn’t be the be all and end all of how you measure your baby’s well-being. The measurements taken during an ultrasound, including the abdominal circumference, are not always accurate. Ai??It pays to take these measurements and the baby percentile graph with a grain of salt.

Comments (1)

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  1. Kelly says:

    This is a great tool. Thank you.