Metric by which Captain America would be classified as obese (4,4,5)
I believe the answer is:
body mass index
(Other definitions for body mass index that I've seen before include "rating figure?" , "Measure of fat/muscle ratio" , "Person's weight in kilograms divided by the square of their height in metres" , "A measure of fatness" , "Measure of someone's weight in relation to height" .)