Relative masses of body parts

My physics teacher would never have let me get away with saying “weights” when I really meant masses. Be that as it may, while working out at the gym today, I was wondering how the various bits of the body compare in mass - if we were to split up, let’s say, into legs, arms, torso and head, what would be the approximate proportions for the average human?

I’m assuming moderately fit, not obese or bulked up, and I assume it would vary between men and women, but is there some sort of average estimate I can work with here?

An adult, human head weighs about 10 pounds.

Not mass, but area, but maybe it will help. The Rule of Ninesis used in treating burn patients. It does a pretty good job of breaking the surface area into roughly equal parts.

When I was working on Biomechanics, I learned that the Federal Government had funded several studies on this topic, performing several ghoulish experiments were corpses were frozen and carefully sawed into plates, which were then weighed. As a result, there are reports listing body part masses, moments of inertia, and radii of gyration, along with regression formulas that allow them to calculate such properties of living people without having to cut them into similar frozen bits.

One report is by Wilfred Dempster, another by Clauser McConville, and Yung. You can also look at the Stapp Car Crash Conferences for similar results.

See also:

For Clauser et al:
This page gives actual regression data, if yyou want to figure it out on yourself:

That’s from memory, aided by Google Scholar, from 30 years ago. Pretty good, huh?