I tried this site, and it gave me a result smaller than me. So, I don’t believe such correlations. No matter how big your hands, feet or nose are, penis length is primarily determined at the ages 16-20 by the amount of sexual activity or masturbation plus some genetic factors. This occurs while the body is growing with highest growth hormone levels. At least, this is my opinion. ( In my high school years, I learnt at the biology class that any body organ that is used frequently grows and any organ that is not used much shrinks in size with time (Bergman’s Law). I think the same principle applies also to the penis. If you force it to grow when GH levels are at the peaks, it simply grows).