Penis Size Linked to Finger Length

Your finger size may be related to your natural penis size.

You may have heard the common thought that your foot is as long as the distance between your elbow and your wrist. Or, how about the fact that most people are approximately as tall  as the distance from the middle fingertip of one hand to the other, when your hands are held out perpendicular to your body? Chances are you've even heard the theory about penis size and men with big feet. However, have you heard that your penis size is linked to your finger length?

Your finger size may be related to your natural penis size.
Your finger size may be related to your natural penis size.

The Research

Research led by urologist Dr. Tae Beom Kim focused on the relationship between finger measurement and erect and flaccid penis size. 144 men participated in the study.  Dr. Kim and his researchers:

  • Measured the men's index fingers (2D) and their ring fingers (4D), and
  • They also measured their penis while erect and while flaccid.

The Findings

Interestingly, they found that most men had longer ring fingers (4D) than index fingers (2D). Additionally, those with a lower index finger to ring finger ratio (2D:4D – relatively longer ring finger) were found to have longer erect penises.

The researchers noted, “Based on this evidence, we suggest that digit ratio can predict adult penile size, and that the effects of prenatal testosterone may in part explain the differences in adult penile length.”

Previous research has found that this 2D:4D ratio is related to the amount of androgens (testosterones) present in a baby's body during the 8th to 19th week of pregnancy. Where women tend to have ring fingers that are approximately the same length of their index fingers, men have longer ring fingers due to the increased amount of testosterone in the womb.

Measure your fingers from crease to tip.
Measure your fingers from crease to tip.

Men with longer ring fingers are believed to have been exposed to higher levels of testosterone, while in utero. In addition to a naturally larger penis, this has also been linked to increased athleticism, sexuality, aggression, and the ability to more effective trade high-stakes stocks, according to a study at the University of Cambridge.

However, it's not all bonuses for our long-ring fingered friends. Those with a lower 2D:4D ratio (relatively longer ring finger) are also at a higher risk for:

  • Amyotrophic lateral sclerosis (Lou Gehrig's disease),
  • Prostate cancer and
  • Arthritis


  1. Mine are so close to the same length (on both hands), and with my 7.75 BPEL, that does not match the data.

  2. I think there is some truth to this my ratio is 0.93(right hand) which is considered great left hand is about 0.92

    8″ BPEL
    6.5″ Girth.

  3. So what do we do with the graphic telling us to measure from mid-finger to tip? Just left us hanging!

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