Studies
We present here a collection of the available studies about penis size. Most of this studies are performed by qualified stuff and include studies in which the measurements are actually done by the stuff and others in which the task is delegated to the subjects. All the studies are presented with a summary chart that includes the participant, the means and the standard deviation (in brackets when available).
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The study took place in 2001, Turkey. 200 patients admited in the Department of Plastic and Reconstructive Surgery, Gülhane Military Medical Academy, Ankara, Turkey with any kind of symptom other than a genital disorder were included in this study. Measurements were made immediately after the patient as undressed to minimize the effect of temperature. Tape measurements of the penis were obtained to the nearest 0.5 cm by the same examiner.
The article explicitly mentions that the erect length “was measured from the penopubic junction to the tip of the penis in contrast to other studies that accepted the sum of the pubic fat depth and erect length”, so it means Non Bone Pressed. On the other hand, the stretched length is unusually short, which could be explained by different amount of pull than in other studies.
Source: Sengezer M, Öztürk S, DevecI M. Accurate method for determining functional penile length in Turkish young men. Ann Plast Surg 2002;48:381–385
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Conducten in 1998 in Korea over 150 subjects, this study aimed to see if there was a relation between penis size and stature, weight and BMI.
4 measurement were taken: flaccid length, flaccid circumference, erect length and erect circumference. The erect measurement method is not described in the abstract.
The article didn’t find any relations of penis size and any of the studied variables.
Source: Yoon JS, Lee GH, Chang DS. The Relationship between Height and Body Weight and Penile Size in University Students. Korean J Urol. 1998 Nov;39(11):1061-1064
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130 Caucasian men from Colombia underwent 4 measurements: flaccid length, Bone Pressed flaccid length, stretched length and Bone Pressed erect length.
The erection was achieved by an intracavernous drug.
In addition to the data shown in the chart the Bone Pressed flaccid length was 10.49 cm with a SD of 1.3 cm. And the ranges for the other measures were: [6, 13]cm for the flaccid length, [7, 13.5]cm for the Bone pressed flaccid, [10, 21]cm for the erection and [8.8, 19]cm for the stretched length.
Source: Alonso Acuña Cañas. Estudio Antropométrico del Pene. Revista de urología.
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Shneider et al. conducted this study in 2000 in Germany. They measured two groups, one of 111 young men recruited by advertising in schools and another group of 32 older men that presented to their clinic because of erectile dysfunction.
The measures were taken by staff bone pressed, the erection was achieved by self stimulation for the A group and by an injection of prostaglandin E1 in the second group.
*The girth was measured as the diameter of the penis both at the base and the glans. The figures shown in the chart correspond to the ones at the base while the ones at the glans were 3,02 and 3,49 for the A group and 3,01 and 3,32 fot the B group.
The article also mentions the ranges of the measurement taken: flaccid length [5, 14,5], flaccid width at the base [2,0, 4,2], flaccid width at the glans [2,2, 3,7], erect length [10, 19], erect width at the base [2,7, 5,0] and erect width at the glans [2,5, 4,5].
Source: Schneider T. Does penile size in younger men cause problems in condom use? a prospective measurement of penile dimensions in 111 young and 32 older men. UROLOGY 57 (2), 2001
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Herbenick (USA)
| Subjects (N) | 1661 | |
| cm | inches | |
| Flaccid Length | – | – |
| Flaccid Girth | – | – |
| Erect Length | 14,15 (2,66) | 5,6 (1,0) |
| Erect Girth | 12,23 (2,23) | 4,8 (0,9) |
| Stretched length | – | – |
This study published in 2013 used the answers of 1661 men to an internet interview aiming to deliver custom size condoms for their use. For this purpose, had to download and print an erect penile measurement tool. The tool contained detailed, illustrated directions about how to measure their erect penis, from the underside base and choosing the letter or numerical code that is “closest to the end of the head of your penis”. While this methodology is not the usual one described in the measures section, it is intended to measure the penis up to the point a condom would unroll. This would correspond to a Non Bone Pressed measure, although measuring from the underside longer measurements can be easily obtained than from the upper side, which could explain why this study reports slightly longer erect penises than others done with the None Bone Pressed methodology.
The article does not mention where the circumference measurement is taken, although some other custom size condom companies take the measurement at the middle or at the base.
Although this study relies in self reported measurements, the wish of a fitted condom should motivate men to report their actual size specially for the circumference measurement, where the procedure is more standard. This together with the large sample makes this study quite interesting. Also, the authors mention that men with bigger and smaller penises could be more interesting in custom condoms, which could explain why the standard deviation is sensibly higher than in other studies.
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Szemat (Venezuela)
| Subjects (N) | 890 / [30] | |
| cm | inches | |
| Flaccid Length | 9,5 (1,7) | 3,7 (0,7) |
| Flaccid Girth | 8,8 (1,2) | 3,5 (0,5) |
| Erect Length | [12.4 (1,4)] | [4.9 (0,6)] |
| Erect Girth | – | – |
| Stretched length | 12,7 (2,0) | 5,0 (0.8) |
890 Venezuelan men were measured in 2001. 5 measures were taken: flaccid length, flaccid circumference (both at the base and at the glans), stretched length and the glans length. A sub-sample of 30 subjects underwent erect measurement too.
The teem found a correlation between height and penis size (p<0.01) as well as differences between ethnic groups. Among the 890 participants 42.5% were white (378), 41.1% were half-breed (366), 13.7% were black (122) and 2.7% of other ethnic groups (24). The measures according to ethnicity were as follows:
- Black: flaccid length: 10.2 (SD 1.7) cm, stretched length: 13.6 (2.1) cm.
- White: flaccid length: 9.4 (SD 1.6) cm, stretched length: 12.4 (1.9) cm.
- Half-breed: flaccid length: 9.3 (SD 1.6) cm, stretched length: 12.7 (1.8) cm.
- Other: flaccid length: 9.5 (SD 1.7) cm, stretched length: 12.7 (1.7) cm.
Among the sub-sample that underwent erect measurement it was also observed that the stretched length was strongly correlated with the erect length.
Source: R Szmat et al. Dimensiones peneanas población venezolana. Revista venezolana de Urología. Vol 47 ENER04UNIO, 2001Awwad (Jordan)
| Subjects (N) | 109 | |
| cm | inches | |
| Flaccid Length | 7,7 (1,3) | 3,7 (0,5) |
| Flaccid Girth | – | – |
| Erect Length | 11,8 (1,5) | 4,6 (0,6) |
| Erect Girth | – | – |
| Stretched length | 11,6 (1,4) | 4,6 (0,5) |
| Subjects (N) | 271 | |
| cm | inches | |
| Flaccid Length | 9,3 (1,9) | 3,7 (0,75) |
| Flaccid Girth | 8,9 (1,5) | 3,5 (0,6) |
| Erect Length | – | – |
| Erect Girth | – | – |
| Stretched length | 13,5 (2,3) | 5,3 (0,9) |
Awwad et al. conducted this study in 2004 with two groups of Jordanian patients, one of 271 patients attending urology clinic for reasons other than erectile dysfunction, and another of 109 patients attending Jordan specialized center for the treatment of erectile dysfunction.
Patients from group one were measured for flaccid length, midshaft flaccid circumference and stretched length. Patients from group two were measured for flaccid length, stretched length and erect length after trimex injection.
As it is shown in the charts, there is a noticeable difference between the flaccid and stretched lengths among the two groups, and given that there is no evidence relating impotency and penis size, this shows how studies with small samples can result in differing results.
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Sengezer (Turkey)
| Subjects (N) | 200 | |
| cm | inches | |
| Flaccid Length | 6,8 | 2,7 |
| Flaccid Girth | – | – |
| Erect Length | 12,7 | 5,0 |
| Erect Girth | – | – |
| Stretched length | 9,0 | 3,5 |
The article explicitly mentions that the erect length “was measured from the penopubic junction to the tip of the penis in contrast to other studies that accepted the sum of the pubic fat depth and erect length”, so it means Non Bone Pressed. On the other hand, the stretched length is unusually short, which could be explained by different amount of pull than in other studies.
Source: Sengezer M, Öztürk S, DevecI M. Accurate method for determining functional penile length in Turkish young men. Ann Plast Surg 2002;48:381–385
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Yoon (Korea)
| Subjects (N) | 150 | |
| cm | inches | |
| Flaccid Length | 8,26 (1,07) | 3,25 (0,42) |
| Flaccid Girth | 8,34 (1,03) | 3,28 (0,41) |
| Erect Length | 13,42 (1,38) | 5,28 (0,54) |
| Erect Girth | 11,17 (1,05) | 4,40 (0,41) |
| Stretched length | – | – |
4 measurement were taken: flaccid length, flaccid circumference, erect length and erect circumference. The erect measurement method is not described in the abstract.
The article didn’t find any relations of penis size and any of the studied variables.
Source: Yoon JS, Lee GH, Chang DS. The Relationship between Height and Body Weight and Penile Size in University Students. Korean J Urol. 1998 Nov;39(11):1061-1064
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Acuña (Colombia)
| Subjects (N) | 130 | |
| cm | inches | |
| Flaccid Length | 8,95 (1,5) | 3,52 (0,59) |
| Flaccid Girth | – | – |
| Erect Length | 13,90 (1,7) | 5,47 (0,67) |
| Erect Girth | – | – |
| Stretched length | 13,60 (1,6) | 5,35 (0,63) |
The erection was achieved by an intracavernous drug.
In addition to the data shown in the chart the Bone Pressed flaccid length was 10.49 cm with a SD of 1.3 cm. And the ranges for the other measures were: [6, 13]cm for the flaccid length, [7, 13.5]cm for the Bone pressed flaccid, [10, 21]cm for the erection and [8.8, 19]cm for the stretched length.
Source: Alonso Acuña Cañas. Estudio Antropométrico del Pene. Revista de urología.
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Shneider (Germany)
| Subjects (N) | 111 (A) | |
| cm | inches | |
| Flaccid Length | 8,60 (1,50) | 3,39 |
| Flaccid Girth | 3,08 (0,40) | 1,21 |
| Erect Length | 14,48 (1,99) | 5,70 |
| Erect Girth | 3,95 (0,38) | 1,56 |
| Stretched length | – | – |
| Subjects (N) | 32 (B) | |
| cm | inches | |
| Flaccid Length | 9,22 (1,67) | 3,63 |
| Flaccid Girth | 2,87 (0,31) | 1,13 |
| Erect Length | 14,18 (1,83) | 5,58 |
| Erect Girth | 3,50 (0,32) | 1,38 |
| Stretched length | – | – |
The measures were taken by staff bone pressed, the erection was achieved by self stimulation for the A group and by an injection of prostaglandin E1 in the second group.
*The girth was measured as the diameter of the penis both at the base and the glans. The figures shown in the chart correspond to the ones at the base while the ones at the glans were 3,02 and 3,49 for the A group and 3,01 and 3,32 fot the B group.
The article also mentions the ranges of the measurement taken: flaccid length [5, 14,5], flaccid width at the base [2,0, 4,2], flaccid width at the glans [2,2, 3,7], erect length [10, 19], erect width at the base [2,7, 5,0] and erect width at the glans [2,5, 4,5].
Source: Schneider T. Does penile size in younger men cause problems in condom use? a prospective measurement of penile dimensions in 111 young and 32 older men. UROLOGY 57 (2), 2001
