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Last updated: February 13, 2026
InBody is more accurate but less accessible and more expensive. Smart Scales is more practical for regular use. Choose InBody for periodic precision testing and Smart Scales for ongoing tracking. For an alternative that balances both, FitCommit AI body scan offers good accuracy at $3.99/month from your phone.
Good accuracy
Poor to moderate accuracy
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.
Home BIA scales send a small electrical current through your feet (and hands, on some models) to measure impedance. The scale uses algorithms to estimate body fat, muscle mass, and water content. Popular brands include Withings, Renpho, and Eufy.
| Category | InBody | Smart Scales | Winner |
|---|---|---|---|
| Accuracy | Good (+/- 3-5%) | Poor to moderate (+/- 5-8%) | InBody |
| Cost | $25-50 | $0 (after purchase) | Smart Scales |
| Convenience | Gyms, clinics, wellness centers | Home (Withings, Renpho, Eufy, etc.) | Smart Scales |
| Time Per Test | 2-3 minutes | 10 seconds | Smart Scales |
| Tracking Frequency | Monthly | Weekly or more | Smart Scales |
FitCommit integrates body scanning, food tracking, and transformation preview into one system. AI body scan measures your composition. AI food camera logs nutrition. After Photo shows your future body. All from your phone.
Try it free →Try all these methods in one app
AI body scan, food tracking, and transformation preview. One system.
FitCommit measures body fat from your phone camera in 60 seconds. No clinic visits, no equipment, no appointments. Good accuracy (+/- 3-5%) at $3.99/month for unlimited scans. Also calculates TDEE, macros, and transformation timelines.
Try FitCommit FreeThe Navy method (tape measure) is free. Skinfold calipers cost $10-30 once. Smart scales cost $30-100 once. FitCommit costs $3.99/month. Clinical methods cost $25-150 per scan. The cheapest accurate option depends on whether you value precision or just need a trend.
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.
DEXA scan is the gold standard (+/- 1-2%). Bod Pod and hydrostatic weighing are close (+/- 2-3%). InBody and AI scans are good for tracking (+/- 3-5%). Calipers depend on the tester (+/- 3-8%). Home BIA scales are the least accurate (+/- 5-8%).
Each method measures a different proxy for body fat. DEXA uses X-rays, BIA measures electrical resistance, calipers measure skin thickness, and AI analyzes visual appearance. They all estimate body fat through different physical properties, which produces different numbers.
Deficit levels with timelines and calorie targets for fat loss
Surplus levels with timelines and calorie targets for muscle gain
Build muscle and lose fat at the same time
Visual reference for every body fat percentage for men and women
Fasting schedules and how they affect fat loss at different body fat levels
Timelines for losing 5 to 100 pounds at different deficit levels
AI body scan from your phone camera. Body fat percentage, lean mass, TDEE, and macros. No equipment. No gym. Free 1-month trial.
Try FitCommit Free