Erect (fully firm) measurement only
Use a flexible measuring tape or a rigid ruler
Measure from the base of the penis at the pubic bone to the tip of the glans
Press the tape/ruler to the pubic bone with gentle, consistent pressure
Measure along the top side (dorsal side)
Record the length in centimeters or inches
If curved, measure along the curve (path length)
Measure girth by wrapping a non-stretch measuring tape around the thickest part
Keep the tape snug but not compressing the tissue
Record girth in centimeters or inches
Take multiple measurements (e.g., 3) and record the average
Use the same method and measuring position each time
Write down date, method, and whether it was fully erect