The average penis length for males is typically around 13 cm, which is considered normal.

Penis length is categorized into flaccid length and erect length:

1. Flaccid length is measured by gently grasping the glans with the thumb and index finger at the coronal sulcus, lifting it, and gradually stretching the penis along its length. Measure at the maximum stretch without applying excessive force.

2. Erect length is measured when the penis is fully erect. The method is similar to the above, ensuring measurement is taken only after complete erection.

Measurement tools and methods:

1. Place a ruler against the pubic bone beneath the skin at the base of the penis;

2. Keep the ruler parallel to the penis;

3. The distance from the pubic bone to the tip of the glans represents the penis length.

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