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Last updated: February 13, 2026
Calipers can be accurate in the hands of a skilled tester, but results vary widely between practitioners. FitCommit provides more consistent results without needing another person to measure you. For self-tracking at home, FitCommit is the clear winner.
Good accuracy
Moderate accuracy
Uses computer vision AI to analyze three photos (front, side, back) and estimate body fat percentage, lean mass, and body composition. Results in under 60 seconds.
A trained person pinches your skin at 3-7 specific body sites (chest, abdomen, thigh, etc.) and measures the thickness of the skinfold with calipers. The measurements are plugged into a formula (Jackson-Pollock or Durnin-Womersley) to estimate overall body fat percentage.
| Category | FitCommit | Calipers | Winner |
|---|---|---|---|
| Accuracy | Good (+/- 3-5%) | Moderate (+/- 3-8%) | FitCommit |
| Cost | $3.99/mo (unlimited) | $0-30 | FitCommit |
| Convenience | Phone camera, anywhere | Home, gyms, personal trainers | FitCommit |
| Time Per Test | 60 seconds | 5-10 minutes | FitCommit |
| Tracking Frequency | Weekly or more | Monthly | FitCommit |
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 calculates lean mass, TDEE (using the Katch-McArdle formula from your lean mass), daily macro targets, and generates a transformation timeline. It also includes AI food scanning for macro tracking.
FitCommit works well for tracking direction and rate of change during a prep. For stage-day precision (sub-1% accuracy), a DEXA scan closer to competition is recommended. Many competitors use FitCommit weekly and DEXA quarterly.
Most apps estimate TDEE from height, weight, age, and a generic activity multiplier. FitCommit measures your lean mass via body scan and uses the Katch-McArdle formula (BMR = 370 + 21.6 x lean mass in kg), which is more accurate because muscle tissue burns more calories than fat.
A smartphone camera, decent lighting, and form-fitting clothing (or minimal clothing). Take three photos: front, side, and back. The AI processes results in under 60 seconds. No special equipment or appointments needed.
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