These methods solve different problems. DEXA offers a tighter published measurement range; InBody may be easier to repeat. Choose based on the decision you need to make, the setting you can repeat, and the limitations you can control.
Gold standard accuracy
Good accuracy
Dual-energy X-ray absorptiometry uses two X-ray beams at different energy levels to measure bone mineral density, lean tissue, and fat tissue. You lie on a table for 10-20 minutes while the scanner passes over your body.
InBody uses bioelectrical impedance analysis (BIA) by sending small electrical currents through your body via hand and foot electrodes. It measures resistance to estimate water content, lean mass, and fat mass across different body segments.
| Category | DEXA | InBody | Winner |
|---|---|---|---|
| Accuracy | Gold standard (+/- 1-2%) | Good (+/- 3-5%) | DEXA |
| Cost | Check local provider pricing | $25-50 | InBody |
| Convenience | Clinics and medical facilities only | Gyms, clinics, wellness centers | InBody |
| Time Per Test | 10-20 minutes | 2-3 minutes | Tie |
| Tracking Frequency | Quarterly | Monthly | InBody |
Accuracy ranges on this page are directional estimates from body-composition research. These methods do not measure the same physical signal, so the cleanest comparison is trend consistency, cost, access, and whether you need a clinical-grade baseline. Use one method under consistent conditions, and use clinical testing when a medical or research-grade answer matters.
FitCommit connects a photo-based body-composition estimate, food tracking, and an After Photo preview in one system. Each tool uses the same plan and progress inputs.
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AI body scan, food tracking, and transformation preview. One system.
FitCommit uses three phone photos to estimate body fat and lean mass for at-home trend tracking. It connects the estimate to TDEE, macro targets, After Photo, and food tracking.
Try FitCommit FreeHome methods (smart scales, navy method, calipers) are less accurate than clinical methods. But they are useful for tracking trends if you test consistently at the same time, same conditions. Do not obsess over the absolute number. Watch the direction.
Every 3-6 months for most people. More frequently is expensive and unnecessary since body composition changes slowly. Use a cheaper method (like FitCommit or calipers) for monthly tracking, then validate with DEXA quarterly.
A tape-based method only requires a tape measure. Calipers and smart scales require equipment, FitCommit is an app subscription with a free trial, and clinical-method pricing varies by provider and location. Choose based on whether you need a rough trend or a clinical baseline.
BIA scales measure something real (electrical impedance), but the conversion to body fat percentage is inaccurate, often off by 5-8%. They are better at tracking weight than body fat. If you use one, test at the same time daily and look at weekly averages, not individual readings.
Deficit levels with timelines and calorie targets for fat loss
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Visual reference for every body fat percentage for men and women
Plan meal timing around training, eating windows, and macro targets
How many calories you need per day by age, gender, and activity
Realistic timelines for any weight loss goal
Take three photos to estimate body fat and lean mass, then connect the result to your targets and weekly trend.
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