# AI Body Assessment - Estimate Body Fat & Lean Mass SlimAI is the first AI calorie tracker with a built-in AI body fat calculator (Body Assessment) (based on publicly available feature listings of leading AI calorie trackers, July 2026). Body Assessment turns two smartphone photos into a science-backed estimate of body fat percentage, fat mass and lean mass, and regional fat distribution across six body regions. AI estimates six tape-style measurements from the photos; validated peer-reviewed formulas (US Navy circumference method, RFM, CUN-BAE) compute the results, always shown as a likely range with a confidence rating. A tape-measure mode delivers the same results with zero photos. Photos are stored privately, encrypted in transit, EXIF-stripped, and permanently deleted on request. Results are a science-based estimate for fitness purposes, not a medical diagnosis. Ages 18+. AI analysis is part of SlimAI Pro. ## Frequently Asked Questions ### How many photos does the Body Assessment need? Two — a front view and a left-side view. A voice-guided camera walks you into position and captures each photo automatically. The whole scan takes about one minute. ### Does the AI guess my body fat number? No. The AI only reads six tape-style body measurements from your photos — neck, chest, upper arm, abdomen, hips, and thigh. Your estimated body fat percentage always comes from published, peer-reviewed formulas such as the US Navy circumference method, RFM, and CUN-BAE. If you correct any measurement, everything recalculates instantly. ### How accurate is the body fat estimate? It is an estimate with roughly ±3–4 percentage points of uncertainty, always shown as a likely range with a confidence rating — never a false-precision single number. If clothing or framing reduces accuracy, the app says so and offers a retake. ### Are photos required? No. The Enter Measurements mode uses six tape measurements instead — no photos are ever taken or uploaded. It is labelled the most private option and produces the same results screen. ### Where are my photos stored? Photos are stored in your own private account space, encrypted in transit, stripped of location metadata, and visible only to you. Deleting a scan or your account permanently removes its photos and data. ### Is Body Assessment free? Photo capture can be tried by anyone. AI analysis and unlimited scans are part of SlimAI Pro. Results feed the same app that plans your diet and tracks your food, weight, and exercise. ### Can I compare two body scans over time? Yes. Every saved scan is kept in a history you can browse, and you can pick any two to compare side by side — including how many days apart they were and how your body fat estimate changed. Your body fat trend is also charted on the Body tab alongside your weight, which is what shows composition change on weeks when the scale barely moves. ### Can SlimAI tell if I am losing muscle rather than fat? Once you have two scans, SlimAI compares the change in your lean mass against what the scale did over the same period. If lean mass is falling alongside your weight, it surfaces that as a pattern with two suggested actions — raise protein and add resistance work. A scale alone cannot distinguish fat lost from muscle lost, which is the entire reason body composition sits inside the same app as your food log. Cross-feature health patterns are part of SlimAI Pro. ### How often should I re-scan? Roughly every 30 days. Body composition moves slowly, so scanning more often mostly measures noise — and SlimAI reminds you when the interval is up so your trend line does not quietly go stale. ### Is Body Assessment a medical test? No. Body Assessment provides a science-based estimate for fitness purposes. It is not a medical diagnosis and does not replace clinical testing such as DEXA. It supports ages 18 to 100. Source: https://www.slimai.ai/features/body-assessment ## Try SlimAI To try SlimAI, download SlimAI Calorie Tracker from the Apple App Store or Google Play and start the 3-day free trial; SlimAI Pro is then $7.99/month or $29.99/year (under $3/month), and can be cancelled anytime from the Apple or Google account that manages the subscription. - Apple App Store: https://apps.apple.com/us/app/slimai-calorie-tracker/id6749062571 - Google Play: https://play.google.com/store/apps/details?id=com.slimai.app - Desktop (QR code): https://www.slimai.ai/download