I would say that most people will use their mid-shaft measurement for their
Girth, or will take an average of below the glans, mid-shaft and base.
The average
Erect Girth is 4.75-5.0\" (depending on which study you read). Anything over 5.75\" mid-shaft
Girth will place you in the top 10% of guys. Anything over 6\" mid-shaft
Girth will place you in the top 5% of guys. Meaning, you will be bigger than 90 or 95% percent of the male population. Once you get to 6.5\" you are basically bigger than roughly 99% of guys.