How many cm human skull is long?

5 seconds on Google later..
The average skull thickness for men is 6.5 millimeters, and the average for women is 7.1 mm. The average front-to-back measurement is 176 mm for men and 171 mmfor women, and the average width is 145 mm for men and 140 mm for women.

https://ohsonline.com/Articles/2008/01/Study-Womens-Skulls-Thicker-Mens-Wider-Might-Affect-Protection-Design.aspx