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www.reference.com/science/average-human-head-circumference-d6158b1df94ba148

The average head circumference of an adult male and female is 22.44 and 20.87 inches, respectively. However, averages vary widely depending on the age and ethnicity of the individual. Forensic anthropologists at the University of Tennessee, Knoxville have recently determined that American head size is on the rise.

en.wikipedia.org/wiki/Human_head

Reference charts for adult head circumference also generally feature homogeneous samples and fail to take height and weight into account. One study in the United States estimated the average human head circumference to be 57 centimetres (22 1 ⁄ 2 in) in males and 55 centimetres (21 3 ⁄ 4 in) in females.

www.quora.com/How-many-inches-is-the-human-head-in-circumference

Human heads, of course, vary. The easiest way to know the range of human head circumference is to go hat shopping! Hats are traditionally sold by the diameter of the hat, in inches. Times pi, and you have circumference. Going to Hats.com, they hav...

www.reference.com/science/average-size-human-head-62364d028e431bf3

Through collected data and reports, it has been determined that the average human head measures 6-7 inches in width and 8-9 inches in length. The average circumference of the human head is 21-23 inches. There are several factors that determine the exact size of each individual’s head. These uncover some of them. Gender

www.answers.com/Q/What_is_the_average_head_circumference_of_a_human_being

The average circumference of the human head in men is 55.9 cm. The average circumference of a woman's head is 54.47cm. There is rarely more than 2cm difference either way.

www.cdc.gov/growthcharts/html_charts/hcageinf.htm

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www.refinery29.com/en-us/average-head-size

There was! The national average is estimated to fall between 22 and 23 inches, but there is no current government data on adult head size. Science has other stuff going on, guys.

www.thundersplace.org/penis-enlargement-basics/average-glans-stats.html

Average Glans stats . Guys, I’m wondering what’s the average head size, & I’m concerned about increasing my head size. I’d appreciate if you guys post your measurements, esp. guys who increased their head. My head length is 1.5”, head circumference (at the base of the glans) is 4”.

www.infantchart.com/who0to5headforage.php

A percentile of 50% represents the average or mean head circumference. A value below 50 percent means a child's head circumference is less than the average. A value greater than 50 percent means a childs's head circumference is above average. A doctor or physician should be consulted to determine growth status.

www.ncbi.nlm.nih.gov/pmc/articles/PMC1793909

In this study the head circumference and heights of 354 adults in two British centres were measured. The centile charts constructed from these measurements show that adult head circumference is related to height. The mean head circumference of a male of average height is above the 97th centile for a 16 year old on the Tanner charts.