What research tells us about average penis size

Determining the average penis size for a group of males, let alone for men around the world, is more complicated than you might imagine. Unfortunately most information about average penis size comes from popular culture and not science. Let’s start by considering some figures from science.

The results from three studies of penis size where the measurements were taken in a laboratory setting give the following ranges:

• Average penis length (flaccid/not erect): from 3.4 inches to 3.7 inches (8.6 cm to 9.3 cm)
• Average penis length (erect): from 5.1 inches to 5.7 inches (12.9 cm to 14.5 cm)
• Average penis girth (circumference when erect): from 3.5 inches to 3.9 inches (8.8 cm to 10 cm)

These numbers are obviously very different from the sizes we hear (and see) in adult movies, and even the kinds of numbers you read on line.

Why such a difference?

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