Average Erect Length in United States
Mean length12.89 cm5.07 in
Standard deviation±2.91 cm±1.15 in
5th percentile8.1 cm
95th percentile17.7 cm
Erect length — United States (country study) Distribution (cm)
Wessells et al. (1996, n=80)
Average Erect Girth in United States
Mean girth12.30 cm4.84 in
Standard deviation±1.31 cm
5th percentile10.1 cm
95th percentile14.5 cm
Erect girth — United States (country study) Distribution (cm)
Wessells et al. (1996, n=80)
Erect Size: How United States Compares
A clinical study of Wessells et al. (1996, n=80) found the average erect length in United States to be 12.89 cm (5.07 in), which is approximately 0.23 cm below the global average of 13.12 cm (5.17 in). The mean erect girth is 12.30 cm (4.84 in).
Average by Country
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