Body fat guides

Short, sourced answers to common questions about estimating body fat.

• How accurate is AI body fat from a photo?

  What a photo can and cannot tell you about body fat, the typical margin of error, and how to read an estimated range.

• What does a body fat percentage look like?

  What different body fat percentage ranges tend to look like for men and women, and why the same number can look different from person to person.

• Photo vs DEXA, calipers and BIA: which body fat method is best?

  How a photo-based body fat estimate compares with DEXA scans, skinfold calipers and bioimpedance scales on cost, convenience and typical error.

• Can ChatGPT estimate body fat from a photo?

  What a general-purpose chatbot can do with a body photo, where it falls short, and when a purpose-built photo scan is the better fit.

Estimates are for fitness purposes only, not a medical measurement or diagnosis.