over all countries the average size of a penis is about 13. according to one study published in the british journal of urology international (bjui), the average length of a flaccid penis is 3. According to the latest, most comprehensive study to date using 500,000 males, the average length of a japanese males erection is 13. studies show that the average length of a flaccid penis was between 7 and 10 centimeters which is around 2. Average penis girth when in a flaccid state was around 10 centimeters which is around5 inches. Average penis length and girth by ethnicity - charts and comparisons when it comes to ethnicity - penis sizes vary. They do not vary enough to say that for example all black men have larger penis than white men, because clearly this isnt true. There are no average length figures for teenagers because people grow at different rates. 75in) long when not erect, but its normal for them to be shorter or longer than this. Some things can make your penis temporarily smaller, such as swimming or being cold. All studies done on the measurement of the penis have a strong indication that the average penis size worldwide is in the range of 12. Gain up to 3-7 full inches in length grow bigger in 14days penis enlargement cream & pills contact dr santy jatto via whatsapp 2348145243120. 42cm while in reality they only got 2 cm, if not transplanted. A study of 115 men from nigeria found that the average flaccid stretched penis length of nigerian males is 13. 26 inches) long, which is near identical to the worldwide average, stretched flaccid penis length of 13. currently, the countries with the largest average penis size, 7. The united states (and other caucasian-population countries), on the other hand, have a modest average, which is around 5.