Average Penis Size

Alfred Kinsey, pioneering sexologist, was the first to do a mass scientific survey of human sexual behavior, collecting some 18,000 sexual histories. From the beginning, the validity of Kinsey’s studies was questioned. Nevertheless, his research remains the main body of knowledge in sex research, a benchmark against which subsequent studies are measured.

Kinsey and associates (1948)collected data concerning average male penis size from 3,500 adult men. All length measurements were taken when the penises were erect, along the top of the penis, from the point where the top of the penile shaft meets the pubic area to the tip. The foreskin was retracted in uncircumcised men. All girth measurements were taken from around the middle of the penis. Later data published included flaccid penis length. In summary, Kinsey found that the average penis size is 6.36 inches in length and 4.94 inches in girth. See graph below:

When the Durex Condom website was updated in 1998, they asked men to take part in a penis size survey Durex considers that “a man’s penis size is a key part of the equation that decides whether a condom fits properly or not, and if a condom fits properly it is more likely to be used consistently and successfully.”

2,936 men took part in the survey. Both penis length and penis girth varied widely. The average values were 6.4 inches for erect penis length and 5.2 inches for erect penis girth. There was wide variation in penis size and shape, with the widest point most likely the penis head.

Length	% of men		Circumference	% of men
3.75″ = 9.52 cm	0.2 %		1.50″ = 3.81 cm	0.3 %
4.00″ = 10.16 cm	0.3 %		1.75″ = 4.44 cm	0.4 %
4.25″ = 10.79 cm	0.2 %		2.00″ = 5.08 cm	0.4 %
4.50″ = 11.43 cm	0.7 %		2.25″ = 5.71 cm	1.2 %
4.75″ = 12.06 cm	0.8 %		2.50″ = 6.35 cm	0.3 %
5.00″ = 12.70 cm	2.9 %		2.75″ = 6.98 cm	0.3 %
5.25″ = 13.33 cm	2.0 %		3.00″ = 7.62 cm	0.4 %
5.50″ = 13.97 cm	4.4 %		3.25″ = 8.25 cm	0.4 %
5.75″ = 14.60 cm	9.0 %		3.50″ = 8.89 cm	0.9 %
6.00″ = 15.24 cm	10.8 %		3.75″ = 9.52 cm	1.1 %
6.25″ = 15.87 cm	24.3 %		4.00″ = 10.16 cm	4.7 %
6.50″ = 16.51 cm	23.9 %		4.25″ = 10.79 cm	6.3 %
6.75″ = 17.14 cm	9.3 %		4.50″ = 11.43 cm	17.1 %
7.00″ = 17.78 cm	6.7 %		4.75″ = 12.06 cm	11.7 %
7.25″ = 18.41 cm	1.0 %		5.00″ = 12.70 cm	24.1 %
7.50″ = 19.05 cm	1.0 %		5.25″ = 13.33 cm	9.9 %
7.75″ = 19.68 cm	0.9 %		5.50″ = 13.97 cm	11.5 %
8.00″ = 20.32 cm	0.8 %		5.75″ = 14.60 cm	3.0 %
8.25″ = 20.95 cm	0.3 %		6.00″ = 15.24 cm	3.9 %
8.50″ = 21.59 cm	0.3 %		6.25″ = 15.87 cm	0.5 %
8.75″ = 22.22 cm	0.1 %		6.50″ = 16.51 cm	0.5 %
9.00″ = 22.86 cm	0.1 %		6.75″ = 17.14 cm	0.1 %