I assume you mean when it's erect, but I'll add in something else too. For a flaccid penis, it can range from 3-4 inches, but some factors make it change temporarily(like if you are cold). For an erect penis, I've read from 5-6 inches is pretty normal. Circumference I've read is almost an average of 5 inches either way, and diameter ranges from 1 1/4-1 1/2. Hope this helps.