Tanner scale

Illustration of the Tanner scale for males.

Tanner I

testicular volume less than 1.5 ml; small penis (prepubertal; typically age nine and younger)

Tanner II

testicular volume between 1.6 and 6 ml; skin on scrotum thins, reddens and enlarges; penis length unchanged (9–11)

Tanner III

testicular volume between 6 and 12 ml; scrotum enlarges further; penis begins to lengthen (11–12.5)

Tanner IV

testicular volume between 12 and 20 ml; scrotum enlarges further and darkens; penis increases in length (12.5–14)

Tanner V

testicular volume greater than 20 ml; adult scrotum and penis (14+)

Photos of the Tanner scale for males.

Photos of the Tanner scale for females.

Illustration of the Tanner scale for females.

Tanner I

no glandular tissue: areola follows the skin contours of the chest (prepubertal) (typically age 10 and younger)

Tanner II

breast bud forms, with small area of surrounding glandular tissue; areola begins to widen (10–11.5)

Tanner III

breast begins to become more elevated, and extends beyond the borders of the areola, which continues to widen but remains in contour with surrounding breast (11.5–13)

Tanner IV

increased breast sizing and elevation; areola and papilla form a secondary mound projecting from the contour of the surrounding breast (13–15)

Tanner V

breast reaches final adult size; areola returns to contour of the surrounding breast, with a projecting central papilla. (15+)

Tanner I

no pubic hair at all (prepubertal) (typically age 10 and younger)

Tanner II

small amount of long, downy hair with slight pigmentation at the base of the penis and scrotum (males) or on the labia majora (females) (10–11.5)

Tanner III

hair becomes more coarse and curly, and begins to extend laterally (11.5–13)

Tanner IV

adult-like hair quality, extending across pubis but sparing medial thighs (13–15)

Tanner V

hair extends to medial surface of the thighs (15+)

Height Growth Conclusion

Sometime during Tanner 5, females stop growing and reach their adult height, usually this happens in their mid teens at 15 or 16 years for females. Males also stop growing and reach their adult height sometime during Tanner 5, usually this happens in their late teens at 18-19 years for males.[8][9][10]