Head Circumference Calculator
Use this tool to get an idea about head size in comparison to other people of your race or ethnicity. In babies and children, measuring head size is an important way to track brain growth. It's also useful for identifying sudden changes in head size (such as when there is a brain tumor). Please note that although the data in this tool come from peer-reviewed studies, it can't be used to diagnose a disease. See your doctor if you think something is not right with you or your child.
Please provide some information about yourself or your child. We don't record or keep any information you enter here. The categories for Mixed Race and Race/Ethnicity not on this list" use data from the World Health Organization.
References for data used here may be found on our calculator references page.
Page last modified on 5 April 2022.
