what is the verage head width for a man? I have been giving a project to complete before i begin my biology course in september and this is one of the questions. I have looked on internet , some sites say 17-18cm and others say 6 inches (15.50cm). I measured my own head and it is 16cm wide, what is the average head width? is 16cm wide, average or below average? thanks

There is no one right or wrong answer. It will depend on the population being sampled, the age and sex. I suspect the various figures you have found are likely to be correct.