Why the two lengths can be close
The distance from the inner elbow to the wrist measures most of the forearm; foot length runs from heel to toe. They are different body dimensions, but both develop as part of the same growing body. That can make them roughly comparable in one person without making them identical or governed by a fixed ratio.
The match is a rule of thumb, not a body standard. Genetics, age, and individual growth patterns affect limb and foot proportions, so the comparison may be noticeably off—especially between different people.
A handy estimate, not a measurement
The relationship can be useful when you have no ruler: your forearm offers a quick, personal reference for estimating a foot-length distance. But it is not precise enough for tasks where fit or safety matters. For those, measure directly; a rough body-based estimate can be a starting point, not a substitute.






