Is there an app that measures body fat?
Yes, four kinds, and they work very differently. Here’s what each measures and how much to trust it.
Short answer
Yes. AI photo apps estimate body fat from your photos (ProgressLens adds tape measurements for a steadier range), 3D scan apps like MeThreeSixty build an avatar, smart scale apps use electrical impedance, and tape calculators use the US Navy formula. None is as accurate as a DEXA scan; for tracking, consistency matters more than any single reading.
The four kinds
| Kind | Examples | How it works | Watch out |
|---|---|---|---|
| AI photo apps | ProgressLens, GainFrame, trackBod, bodyfatAI | AI reads front and side photos | Photo-only numbers swing with light; ProgressLens adds tape |
| 3D scan apps | MeThreeSixty, ZOZOFIT, Spren | Guided scan builds a 3D model | Strict poses; some iPhone-only |
| Smart scale apps | Renpho, Withings, InBody | Electrical impedance through your feet | Swings with water and food |
| Tape calculators | Our free body fat calculator | US Navy formula from neck, waist, hips | Measuring technique matters |
Can AI really determine body fat?
It can estimate it. Research on smartphone photo methods shows errors of a few points against DEXA under controlled conditions; real-world photos add more. Two things make AI estimates useful: a consistent setup, and anchoring the photo read with measurements. Read AI body fat from photo and tape.
Is there a free one?
Tape calculators are free (ours runs in your browser). AI apps usually charge after a free scan or trial, because AI costs money to run. ProgressLens is free to download with Pro as an in-app subscription.
Which to pick
- Tracking change and deciding to cut or bulk: ProgressLens.
- A 3D avatar: MeThreeSixty.
- Daily weigh-ins: a smart scale, read as a weekly trend.
- Free: a tape measure and our calculator.
FAQ
Frequently asked questions
Is there an app that can tell your body fat percentage from a picture?
Yes. AI photo apps estimate it from front and side photos; ProgressLens combines photos with tape measurements for a steadier range.
Can my phone measure body fat?
Your phone camera can estimate it with an app; it can’t measure it the way a DEXA scan does.
Is body fat AI free?
Some offer a free first scan; ongoing AI analysis is usually paid. Tape calculators are free.