What is a good girth?
A good girth is 11.66 cm (4.59 in) erect or anything above it — and at 12.7 cm (5 in) you're already near the 83rd percentile, sitting squarely in thick territory.
A “good” girth starts at average and gets impressive fast. The clinician-measured mean erect girth is 11.66 cm (4.59 in). Land on that number and you’re solidly normal. You barely have to climb to count as thick: by 12.7 cm (5 in) you’re already around the 83rd percentile, wider than four men in five.
These numbers aren’t bathroom-tape guesswork. They come from Veale et al. (2015, BJU International), which pooled measurements from 15,521 men taken by clinicians. The same dataset pins average erect length at 13.12 cm (5.16 in) — a handy anchor, because girth is the dimension men forget to think about. They shouldn’t. A snug fit is mostly a question of circumference, and it’s a big part of what women notice.
Here’s the part most guys miss: the scale is brutally compressed. One centimeter of circumference vaults you from average into the top fifth of men. There’s no secret “ideal” lurking way above that. The gap between typical and thick is tiny, and most men are already standing inside it.
See the full spread in our penis size statistics, or settle the debate in girth vs. length.
Measure your own and find your exact percentile -> calculator