11 Smart Scale Metrics Explained: Body Composition, Accuracy, and How to Use Them

6. Bone Mass (estimated)

Some scales provide a bone-mass estimate, usually reported as the estimated weight of mineral in your skeleton. This is not the same as a bone-density T-score from a DEXA scan, which clinicians use to diagnose osteoporosis. The scale’s bone-mass number is an algorithmic guess intended for trend tracking rather than clinical decision making. Changes over time can be useful—especially for older adults concerned about bone health or people changing diet and exercise. Strength training and calcium- or vitamin-D–rich diets support bone maintenance. However, if the scale shows a drop in bone-mass estimate, don’t assume you have weakening bones; instead, discuss with your doctor and consider a DEXA test for accurate density measurement. In short, treat bone-mass values as a nudge to check lifestyle factors and get clinical testing when risks are present.