What's the Average American Woman's Bust Size?

bra, bras, brassiere, biomechanics — The average woman's bust size has risen over recent years in the U.S.

(Image credit: Bo Valentino | Shutterstock)

In the last 15 years, the average bust size has increased from 34B to 36C. Whether the lift is due to breast augmentation surgeries or a side-effect of expanding waistlines is not known.

Either way, from slinky to full-coverage undergarments, bras have graced the bodies of women since the 1800s. But modern bra sizing didn't come into fashion until 1928.

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Jeanna Bryner is managing editor of Scientific American. Previously she was editor in chief of Live Science and, prior to that, an editor at Scholastic's Science World magazine. Bryner has an English degree from Salisbury University, a master's degree in biogeochemistry and environmental sciences from the University of Maryland and a graduate science journalism degree from New York University. She has worked as a biologist in Florida, where she monitored wetlands and did field surveys for endangered species, including the gorgeous Florida Scrub Jay. She also received an ocean sciences journalism fellowship from the Woods Hole Oceanographic Institution. She is a firm believer that science is for everyone and that just about everything can be viewed through the lens of science.