What's the circumference of the average human head?

Question

also, what's the distance between the brain and the skull?

Answer 1

It's about 0.00278 furlongs if my math is correct

Answer 2

The average circumference of the human head is about 55.9cm for men, it is 54.47cm for women. You can expect this figure to deviate to no more than 2cm.

  

The distance between the brain and the skull is considerably small. this is to counteract knocks to the skull. This distance is probably roughly (0.7cm).

    

Just for you, The average human head weighs 3.6kg.

Just to let you know there's no correlation between intelligence and human head size