The Drawing Young Adult Human Proportions Calculator takes the figure's head size and defines other areas of the human body in proportion to the head size.
The Drawing Young Adult Human Proportions Calculator takes the head size of the figure and calculates eight figure drawing proportions based on a figure that is 7.5 head units tall.
Anatomy for Sculptors (https://anatomy4sculptors.com/pages/hpc)
Picture: Figure Drawing 211 (https://figuredrawing211.wordpress.com/2014/01/27/the-figure-as-a-cube-perspective/)