Does Shoe Size, Hand Size, or Height Predict Penis Size?

Understanding Correlation

A correlation coefficient (r) ranges from 0 to 1. An r of 1.0 means perfect prediction — knowing one measurement tells you the other exactly. An r of 0 means zero relationship — knowing one tells you absolutely nothing about the other.

In social science, r = 0.1 is considered "trivial," r = 0.3 is "small," and r = 0.5 is "moderate." Every body-part-to-penis correlation falls in the "trivial" range. You would literally be better off guessing randomly than trying to predict penis size from shoe size.

What the Studies Found

Shoe Size: r = 0.01 (Basically Zero)

The most famous study (Shah & Christopher, 2002, BJU International) measured 104 men's feet and penises. Their conclusion was blunt: "There is no scientific basis for the relationship." A man wearing size 8 shoes is equally likely to have any penis size as a man wearing size 13.

Hand Size: r = 0.07 (Still Nothing)

Multiple studies have tested finger length, palm width, and overall hand size. The results are consistently negligible. The popular "digit ratio" theory (index-to-ring finger ratio correlating with testosterone exposure) shows similarly weak results for predicting genital size.

Height: r = 0.09 (The Closest, But Still Useless)

Height shows the strongest correlation of any body measurement — and it's still trivially small. A 2015 study of 5,122 men found that height explained less than 1% of the variance in penis length. Short guys are just as likely to be large as tall guys, and vice versa.

Nose, Ears, Thumb, Index Finger...

All tested. All negligible. The human body simply doesn't work like a proportional scaling model. Different body parts are controlled by different genes and respond to different hormonal signals during development.

Why People Believe This

• Confirmation bias: You remember the time a tall guy had a big penis. You forget the 10 times he didn't.
• Proportional thinking: It seems intuitive that bigger bodies = bigger everything. But noses, ears, and penises don't scale with femur length.
• Cultural reinforcement: The "big feet" joke has been around for centuries. Repetition creates belief.
• Selective exposure: In porn, the tall guys ARE cast specifically for being large. It's selection bias, not correlation.

What DOES Correlate (A Little)?

The only measurement that shows a weak-but-real correlation with erect size is stretched flaccid length (r ≈ 0.6). This makes sense because you're literally measuring the same organ in two states. Everything else — external body measurements — is noise.

The Bottom Line

You cannot predict penis size from any external body measurement. Not feet, not hands, not height, not nose, not ears, not finger ratios. The correlations are so weak they're statistically meaningless. If someone tells you they can "tell" from looking at a man's body, they're repeating folklore, not science.

The only way to know is to know. And for your own size, the calculator uses actual measurement data — not your shoe size.