How do you measure your penis correctly, according to a urologist
Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate
Dec 09, 2025 · 13 min read
Urologists measure penis length as “bone‑pressed” length—press a rigid ruler into the pubic bone on the top side and measure straight to the tip (glans)—and measure girth by wrapping a tape measure around the mid‑shaft; with this standardized method, the average erect length is about 5.1–5.5 inches and the average erect girth is about 4.8 ...