Dr. Greene’s Answer:
In determining size, the “stretched penile length” is far more important than the “relaxed length.” To evaluate penis size, stretch the penis gently and measure from the bone at the base all the way to the tip. Be sure to depress the surrounding fat pad to get all the way to the base. Here are the normal values:
|
Age
|
Normal: Mean +/- 1 SD (inches)
|
Abnormal: Mean – 2.5 SD (inches)
|
|
0-5 months
|
1.5 +/- 0.3
|
0.75
|
|
6-12 months
|
1.7 +/- 0.3
|
0.9
|
|
1-2 years
|
1.9 +/- 0.3
|
1.0
|
|
2-3 years
|
2.0 +/- 0.4
|
1.1
|
|
3-4 years
|
2.2 +/- 0.4
|
1.3
|
|
4-5 years
|
2.2 +/- 0.4
|
1.4
|
|
5-8 years
|
2.4 +/- 0.4
|
1.5
|
|
8-11 years
|
2.5 +/- 0.4
|
1.5
|
|
Adult
|
5.2 +/- 0.6
|
3.7
|
Last reviewed: April 24, 2008
