What is the average penis size?

In Veale et al. 2015, a systematic review of 17 studies with 15,521 men measured by health professionals: erect length 13.12 cm (5.2 in), erect girth 11.66 cm (4.6 in), flaccid length 9.16 cm and flaccid girth 9.31 cm. Self-reported surveys give higher numbers.

What is 3.25 inches in cm?

3.25 inches is 8.26 cm. One inch is exactly 2.54 cm. The Veale 2015 mean of 13.12 cm is 5.2 in.

Is 3.25 inches a normal penis size?

Q: Is 3.25 inches a normal penis size?

3.25 inches erect is longer than under 1% of men in Veale et al. 2015 (mean 13.12 cm, SD 1.66, 15,521 men measured by clinicians). That is two standard deviations or more below the mean, in the bottom 2.5%.

3.25 inches (8.3 cm) erect is longer than under 1% of men, going by Veale et al. 2015, which pooled 15,521 men measured by health professionals: mean 13.12 cm, SD 1.66. That is 1 in 591 at this length or shorter.

Percentile

<1%

of men have a shorter erect length than 3.25 inches

3.25 inches = 8.3 cm

Bottom 2.5%Band by distance from the Veale 2015 mean, in standard deviations: within one SD is the middle two thirds of men. A description of the data, not a clinical category.

3.25 inches by group

By region

Share of men with an erect length under 3.25 inches. Regional means from smaller studies than the pooled figure, with Veale's SD applied to each
Group	Mean	Shorter than you	1 in X
World (Veale 2015)	13.12 cm	<1%	1 in 591
North America	13.58 cm	<1%	1 in 1,495
Eastern Europe	13.46 cm	<1%	1 in 1,166
Sub-Saharan Africa	13.40 cm	<1%	1 in 1,031
South America	13.20 cm	<1%	1 in 691
Western Europe	13.12 cm	<1%	1 in 591
Middle East	13.05 cm	<1%	1 in 517
East Asia	12.90 cm	<1%	1 in 389
South Asia	12.60 cm	<1%	1 in 226

The four measurements in Veale 2015

Means and standard deviations, 15,521 men measured by health professionals
Measurement	Mean	SD	Mean in inches
Erect length	13.12 cm	1.66	5.2 in
Erect girth	11.66 cm	1.10	4.6 in
Flaccid length	9.16 cm	1.57	3.6 in
Flaccid girth	9.31 cm	1.00	3.7 in

Percentile is the share of men with a smaller measurement. “1 in X” counts the rarer side: people at or beyond this value above the median, at or under it below. Percentiles are estimated from a normal distribution with Veale's mean and SD; regional rows use the regional mean with the same SD.

What this means

3.25 inches is 4.86 cm below the mean of 13.12 cm, 2.93 standard deviations. About 68% of men fall between 11.5 and 14.8 cm, and 95% between 9.8 and 16.4 cm.
Clinically, a micropenis is usually defined as an erect length more than 2.5 standard deviations below the mean, about 9.0 cm on these figures. 3.25 inches is at or under that line. The definition is statistical, and a urologist, not a web page, is the place to discuss it.
Self-reported surveys come out higher than measured ones, usually by 1 to 2 cm: men round up, and men who are larger are more likely to answer. Veale et al. used only studies in which a health professional did the measuring, which is why these pages use that data and not survey figures.
Flaccid and erect sizes are different measurements. Veale's flaccid length mean is 9.16 cm (SD 1.57) against 13.12 erect, and flaccid size is a weak guide to erect size. These pages compare erect length only.

Questions

Is 3.25 inches a normal penis size?: 3.25 inches erect is longer than under 1% of men in Veale et al. 2015 (mean 13.12 cm, SD 1.66, 15,521 men measured by clinicians). That is two standard deviations or more below the mean, in the bottom 2.5%.
What is the average penis size?: In Veale et al. 2015, a systematic review of 17 studies with 15,521 men measured by health professionals: erect length 13.12 cm (5.2 in), erect girth 11.66 cm (4.6 in), flaccid length 9.16 cm and flaccid girth 9.31 cm. Self-reported surveys give higher numbers.
What is 3.25 inches in cm?: 3.25 inches is 8.26 cm. One inch is exactly 2.54 cm. The Veale 2015 mean of 13.12 cm is 5.2 in.

Source: Veale et al., BJU International 2015, 115(6): systematic review of 17 studies, 15,521 men measured by health professionals. Erect length mean 13.12 cm, SD 1.66; erect girth mean 11.66 cm, SD 1.10. Regional means from Wylie and Eardley 2007, Herbenick et al. 2014 and Awwad et al. 2005, as used by our test. Percentiles are estimated from a normal distribution with Veale's mean and SD; regional rows use the regional mean with the same SD.

Erect or flaccid, length or girth, cm or inches: your percentile against Veale 2015.

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