How does the length of a femur compare to persons overall height?

There is generally a positive correlation between a person's overall height and femur length. As a person's overall height increases, so does the length of their femur.

There are several studies that provide estimates of the average ratio of femur length to overall height. On average, the human femur accounts for approximately 27% of a person's total height. This ratio can vary between individuals and populations

Overall, while there is variations it can reasonably estimate a person femur length based on their overall height, with the femur typically constituting around 27% of overall height.