Still, based on biacromial measurements taken in years passed and trends observed by researchers, it's probably safe to say that in the United States average shoulder width is at least 16 inches (41 cm) for men and 14 inches (36 cm) for women.Oct 26, 2018. steve Reeves' shoulders, from deltoid to deltoid, measured with a caliper, were 23-1/2 inches.Jul 17, 2006