Specimen No. 014 · Primate
Common Marmoset penis size & anatomy
Callithrix jacchus
Reference measurement
Approx. 17.4 mm / 0.69 in
Representative estimate
Study groups averaged 17.0 and 17.8 mm; calculator uses pooled midpoint for simple comparison.
Measurement source: Human Reproduction (opens in a new tab)
Did you know?
Adult marmoset study groups averaged about 17–18 mm in penis length.
The study used co-twin marmosets, allowing researchers to compare closely matched animals.
Common marmosets are small New World primates, making the measurement a useful scale contrast.