The Navy method is free and useful for a quick circumference-based estimate. FitCommit uses three photos and connects the result to your plan and progress tools.
Photo-based body scan accuracy
Rough accuracy
Uses photo-based AI to analyze three photos (front, side, back) and measure body fat percentage, lean mass, and measurements for trend tracking.
Uses circumference measurements of your neck, waist, and hips (women only) along with your height. These measurements are plugged into a formula developed by the U.S. Navy to estimate body fat percentage. Originally created for military fitness assessments.
| Category | FitCommit | Navy Method | Winner |
|---|---|---|---|
| Accuracy | Photo-based body scan (Similar to InBody) | Rough (+/- 3-5%) | FitCommit |
| Cost | Unlimited scans included | Free | FitCommit |
| Convenience | Phone camera, anywhere | Home (tape measure only) | FitCommit |
| Time Per Test | Take three photos and get your result | 2-3 minutes | Tie |
| Tracking Frequency | Weekly or more | Weekly or more | FitCommit |
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 scan, food tracking, and a Future You preview in one system. Each tool uses the same plan and progress inputs.
Try it free →See how the FitCommit app works →Try all these methods in one app
AI body scan, food tracking, and transformation preview. One system.
FitCommit is designed for tracking a trend. Use a qualified professional and an appropriate clinical method when a precise measurement affects a decision.
FitCommit can use your lean mass with the Katch-McArdle formula instead of relying only on height and weight. The TDEE result remains an estimate and should be adjusted against your real trend.
A compatible iPhone camera, consistent lighting, and form-fitting clothing. Take three photos: front, side, and back. No special measurement equipment or appointment is needed.
DEXA is the better choice when you need a clinical baseline. FitCommit is built for convenient at-home trend tracking. It is as precise as an InBody scan, not a DEXA scan.
Deficit levels with timelines and calorie targets for fat loss
Build muscle and lose fat at the same time
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 measure body fat and lean mass, then connect the result to your targets and weekly trend.
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