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GetLabTest

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Dec 9, 2025
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How much variation exists in erect penis length by age group in U.S. men?

Available large reviews and health reporting place the average erect adult penis length in the U.S. roughly between 5.1 and 5.5 inches (≈13 cm), and most sources say growth completes by the end of ado...

Nov 27, 2025
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How does penis size typically change by Tanner stage during puberty?

Most clinical references say male genital changes during puberty follow the Tanner (sexual maturity) stages: little or no change in Stage I, testicular/scrotal enlargement in Stage II, penis lengtheni...