Average-Size Erect Penis: Fiction, Fact, and the Need for Counseling

Figures & data

Table 1. Summary of studies of penis length (in chronological order).

Authors	Country	Sample	n	Mean	SD
Studies that Relied on Self-Reported Measurements of Erect Penises
Jamison & Gebhard, 1988	US		2,770	6.21 in.	0.77 in.
				15.77 cm	1.96 cm
Richters et al., 1995	Australia		156	6.30 in.
				16.0 cm
Coxon, 1996	England	gay men	118	6.52 in.
				16.56 cm
Smith et al., 1998	Australia		184	6.18 in.	0.91 in.
				15.71 cm	2.31 cm
Bogaert & Hershberger, 1999	US	heterosex.	3,417	6.14 in.	0.74 in.
				15.6 cm	1.88 cm
		gay men	813	6.46 in.	0.82 in.
				16.41 cm	2.08 cm
Harding & Golombok, 2002	England	gay men	312	6.0 in.	0.91 in.
(measurements reported by partner)				15.25 cm	2.31 cm
Promodu et al., 2007	India		93	5.12 in.^1	0.64 in.
				13.01 cm	1.62 cm
Grov et al., 2013	US	gay & bisex. men	463	not reported	64.8% = 6 − 10+ in.
					15 − 25+ cm
Herbenick et al., 2014	US		1,661	5.57 in.^2	1.05 in.
				14.15 cm	2.67 cm
King et al., 2019	US		166	6.41 in.	1.12 in.
				16.28 cm	2.84 cm
Studies of Erect Penises Measured by Researchers:
da Ros et al., 1994	Brazil		150	5.71 in.
				14.5 cm
Wessells et al., 1996	US		80	5.07 in.	1.15 in.
				12.89 cm	2.91 cm
Sparling, 1997	US		81	6.05 in.^3	24.7%>6.5 in.
				15.37 cm	>16.51 cm
Park et al., 1998	Korea		309	4.68 in.	0.52 in.
				11.88 cm	1.32 cm
Chen et al., 2000	Israel		55	5.35 in.	0.67 in.
				13.6 cm	1.70 cm
Schneider et al., 2001	Germany		111	5.70 in.	0.78 in.
				14.48 cm	1.99 cm
Ansell Research, 2001	US/Mexico		300	5.88 in.	0.83 in.
				14.93 cm	2.10 cm
Şengezer et al., 2002	Turkey		200	5.01 in.	0.04 in.
				12.73 cm	0.11 cm
Promodu et al., 2007	India		41	5.09 in.	0.64 in.
				12.93 cm	1.63 cm
Salama, 2018	Egypt		105	5.92 in.	0.59 in.
				15.04 cm	1.51 cm
Yafi et al., 2018	US	erectile	278	5.41 in.	0.75 in.
		dysfunction		13.73 cm	1.9 cm
Studies of Stretched Penises Measured by Researchers:
Schonfeld & Beebe, 1942	US		125	5.15 in.
				13.08 cm
Bondil et al., 1992	France		905	6.59 in.^4	0.90 in.
				16.74 cm	2.29 cm
Siminoski & Bain, 1993	US		63	3.70 in.	0.55 in.
				9.40 cm	1.40 cm
Wessells et al., 1996	US		80	4.90 in.	1.07 in.
				12.45 cm	2.71 cm
Chen et al., 2000	Israel		55	4.92 in.	0.55 in.
				12.5 cm	1.4 cm
Ponchietti et al., 2001	Italy		3,300	4.92 in. (median)
				12.5 cm
Şengezer et al., 2002	Turkey		200	3.54 in.	0.04 in.
				8.98 cm	0.09 cm
Spyropoulos et al., 2002	Greece		52	4.79 in.	0.67 in.
				12.17 cm	1.7 cm
Shah & Christopher, 2002	England		104	5.12 in. (median)
				13.0 cm
Savoie et al., 2003	US		63	5.31 in.	1.02 in.
				13.49 cm	2.59 cm
Son et al., 2003	Korea		123	3.78 in.	0.31 in.
				9.6 cm	0.79 cm
Awwad et al., 2005	Jordan		271	5.31 in.	0.91 in.
				13.5 cm	2.3 cm
Mehraban et al., 2007	Iran		1,500	4.56 in.	0.57 in.
				11.58 cm	1.45 cm
Promodu et al., 2007	India		301	4.28 in.	0.56 in.
				10.88 cm	1.42 cm
Kamel et al., 2009	Egypt		949	5.08 in.	0.75 in.
				12.9 cm	1.9 cm
Aslan et al., 2011	Turkey		1,132	5.39 in.	0.63 in.
				13.7 cm	1.6 cm
Choi et al., 2011	Korea		144	4.61 in.	0.75 in.
				11.7 cm	1.9 cm
Sӧylemez et al., 2012	Turkey		2,276	5.50 in.	0.62 in.
				13.98 cm	1.58 cm
Khan et al., 2012	Britain		610	5.63 in.	0.67 in.
				14.3 cm	1.68 cm
Chrouser et al., 2013	Tanzania		93	4.53 in.	0.63 in.
				11.5 cm	1.6 cm
Shalaby et al., 2015	Egypt		2,000	5.45 in.	0.53 in.
				13.84 cm	1.35 cm
Yafi et al., 2018	US	erectile	278	5.51 in.	0.75 in.
		dysfunction		14.0 cm	1.9 cm

¹ Men in this study likely knew that the researchers would also be taking measurements.

² In this study, men were told to self-report their erect penis length in order to receive condoms that fit them perfectly.

³ Measurements were taken with an unconventional technique: profile photos with a background measurement scale.

⁴ The stretch technique used in this early study has been criticized by others who used the stretch technique.

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