BRI (Body roundness index) measures the roundness of the body and it is one alternative to BMI. BRI's calculation formula better takes into account body shape. The higher the value, the more rounded the person is. The average BRI is 5.
BRI is calculated using height and waist circumference as follows:
Bosy-Westphal A, et al. 2013. Relationships between body roundness with body fat and visceral adipose tissue emerging from a new geometrical model https://pmc.ncbi.nlm.nih.gov/articles/PMC3692604/
Wikipedia: Body roundness index https://en.wikipedia.org/wiki/Body_roundness_index
Xiaoqian Zhang, Ning Ma, Qiushi Lin et al. 2024. Body Roundness Index and All-Cause Mortality Among US Adults https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2819558