---
title: Is There an App That Measures Body Fat? Yes: 4 Kinds
url: https://progresslens.app/guides/is-there-an-app-that-measures-body-fat/
language: en
updated: 2026-11-13
---

# Is there an app that measures body fat?

By the [ProgressLens team](https://progresslens.app/about/) · Updated November 13, 2026

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.

**On this page**
- [The four kinds](#kinds)
- [Can AI really determine body fat?](#can-ai)
- [Is there a free one?](#free)
- [Which to pick](#pick)
- [FAQ](#faq)

## 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](https://progresslens.app/ai-body-fat-from-photo-and-tape-measure/).

### Body fat from photos plus tape.

ProgressLens lines up every photo with your last one, then AI Analyze tells you your body-fat range, what changed, fat vs muscle, and whether to cut or bulk. iPhone and Android, private, no account.

## 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.

## Keep reading

[What is my body fat percentage?Five ways to check at home.Read more →](https://progresslens.app/guides/what-is-my-body-fat-percentage/)[Can ChatGPT estimate body fat?How accurate AI estimates are.Read more →](https://progresslens.app/guides/can-chatgpt-estimate-body-fat/)[Body fat with a tape measureThe US Navy method, step by step.Read more →](https://progresslens.app/guides/how-to-measure-body-fat-with-a-tape-measure/)

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ProgressLens is an AI progress photo app for iPhone, iPad and Android that turns your check-in photos and tape measurements into a Progress Report: your body-fat range, what changed, whether you are losing fat or muscle, and whether to cut, lean bulk, recomp or maintain.
App Store: https://apps.apple.com/app/progresslens/id6806300575
Google Play: https://play.google.com/store/apps/details?id=app.progresslens