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Boy Measurements 5-18 yrs

From various websites compiled as help for writers of boy erotic stories.
Age HEIGHT
from 5th-95th percentile
WEIGHT
from 5th-95th percentile
PENIS SIZE
length - circumference
flaccid erect circ
5 1.02 - 1.17 m / 3'4" - 3'10" 15 - 23 kg / 33½ - 51 lbs. 2½ - 5 cm / 1 - 2" 5 - 10 cm / 2 - 4" 6½ cm / 2½"
6 1.08 - 1.23 m / 3'7" - 4' 19 - 26 kg / 41½ - 58 lbs.
7 1.13 - 1.30 m / 3'8" - 4'3" 18½ - 30 kg / 41 - 66 lbs.
8 1.18 - 1.36 m / 3'10" - 4'6" 20½ - 34½ kg / 45 - 76 lbs.
9 1.23 - 1.42 m / 4' - 4'8" 22 - 39½ kg / 49 - 87 lbs.
10 1.28 - 1.48 m / 4'2" - 4'10" 24½ - 45 kg / 53½ - 100 lbs.
11 1.33 - 1.55 m / 4'4" - 5'1" 27 - 51½ kg / 59 - 114 lbs. 7½ - 9½ cm / 3 - 3.8"
12 1.38 - 1.62 m / 4'6" - 5'4" 30 - 58 kg / 66 - 128 lbs.
13 1.43 - 1.70 m / 4'8" - 5'7" 33½ - 65 kg / 74 - 143 lbs. 4 - 5 cm / 1½ - 2" 12½ cm / 5" 7½ cm / 3"
14 1.49 - 1.77 m / 4'11" - 5'10" 38 - 72 kg / 84 - 159 lbs. 5 - 8 cm / 2 - 3" 13½ cm / 5½" 8½ cm / 3½"
15 1.55 - 1.82 m / 5'1" - 6' 43 - 79 kg / 95 - 174 lbs. 5 - 10 cm / 2 - 4" 14 cm / 5½" 10 cm / 4"
16 1.61 - 1.85 m / 5'3" - 6'1" 47½ - 85½ kg / 105 - 189 lbs. 6 - 10 cm / 2½ - 4" 14½ cm / 5¾" 10½ cm / 4¼"
17 1.65 - 1.87 m / 5'5" - 6'2" 51½ - 91½ kg / 114 - 201 lbs. 7½ - 10 cm / 3 - 4" 14¾ cm / 6" 11 cm / 4½"
18 1.66 - 1.88 m / 5'5" - 6'2" 54 - 96 kg / 119 - 211 lbs. 9 - 10 cm / 3½ - 4" 14¾ cm / 6" 11¾ cm / 4½"
adult - - 9 - 10 cm / 3½ - 4" 14 - 16 cm / 5½ - 6½" 12½ cm / 5"

Puberty and ejaculation

The average age to begin puberty is around 13-years-old. However, a boy may start to fully develop at a young age of 10 or 12, but also a boy may not develop until early teens. Boys would first ejaculate between 10-14.

Tanner scale of physical development of balls and penis

Tanner I
testicular volume less than 1.5 ml; small penis of 3 cm or less (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 to about 6 cm (11–12.5)
Tanner IV
testicular volume between 12 and 20 ml; scrotum enlarges further and darkens; penis increases in length to 10 cm (12.5–14)
Tanner V
testicular volume greater than 20 ml; adult scrotum and penis of 15 cm in length (14+)

Tanner scale of development of pubic hair

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 (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+)