The short answer
InBody scales use bioelectrical impedance (a small electrical current) to estimate body composition, while DEXA uses low-dose X-ray to directly measure fat, lean tissue and bone. DEXA is more detailed and more consistent; InBody is faster and cheaper but strongly affected by hydration.
- InBody / bioelectrical impedance: estimates from electrical resistance; highly affected by hydration, meals and recent exercise; less precise; no bone density measurement.
- DEXA: measures fat, lean and bone mass directly; regional breakdown for arms, legs and trunk; bone density T- and Z-scores; excellent repeatability for long-term tracking.
Which should you choose?
For a quick check at the gym, impedance can be convenient. For higher-quality data you can trust over months and years—especially during weight loss, GLP-1 treatment or a training program—DEXA is generally considered the superior option. At Body Fat USA a full-body DEXA scan is $85. See DEXA vs. InBody vs. Bod Pod
Related questions
Body Fat USA offers $85 DEXA body composition scans and $100 RMR metabolic tests in Denver (both for $175), with reports emailed in about 5 minutes. See all FAQs
