4-Inch Girth: 9th Percentile, Below Average
A 4-inch (10.2 cm) erect girth sits at the 9th percentile: thicker than about 9% of men. That is −1.5 cm against the 11.7 cm average circumference.
How it compares
10.2 cm around works out to about 3.2 cm (1.3 in) across.
This girth calls for a snug / close-fit condom, roughly a 46 mm nominal (lay-flat) width. Fit is set by girth, not length.
What this size means
At the slim end of the curve: about 1 in 12 men are slimmer. Girth has no medical "too small" cutoff the way length does. For comfort and safety, a close-fit condom matters most at this size.
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How this is measured
Girth is the circumference around the thickest part of the erect shaft, measured with a flexible tape or a strip of paper. It is unaffected by the bone-pressed convention that applies to length.
Common questions
What percentile is a 4-inch girth?
It lands at the 9th percentile of erect girth, thicker than about 9% of men, using the Veale 2015 mean of 11.7 cm.
How many men are thicker than a 4-inch girth?
A girth this small is itself uncommon: about 1 in 12 men are slimmer. In a room of 100 men, about 91 would be thicker.
Is a 4-inch girth above average?
It is −1.5 cm against the 11.7 cm average circumference, so 91% of men are thicker.