13 cm Girth: 89th Percentile (Top 11%)
A 13 cm (5.1 in) erect girth sits at the 89th percentile: thicker than about 89% of men. That is +1.3 cm against the 11.7 cm average circumference.
How it compares
13 cm around works out to about 4.1 cm (1.6 in) across.
This girth calls for a large / XL condom, roughly a 59 mm nominal (lay-flat) width. Fit is set by girth, not length.
What this size means
Thicker than about 89% of men. Girth spreads out less than length, so the climb from the 11.7 cm average to the 90th percentile is only about 1.4 cm around, roughly 4–5 mm across.
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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 13 cm girth?
It lands at the 89th percentile of erect girth, thicker than about 89% of men, against the Veale 2015 mean of 11.7 cm.
How many men are thicker than 13 cm?
About 1 in 9 men are thicker. In a room of 100 men, about 11 would be thicker.
Is a 13 cm girth big?
It is +1.3 cm against the 11.7 cm average circumference, at the 89th percentile, so 11% of men are thicker.