Medical disclaimer

All body fat estimates—whether from AI photo analysis, Navy formulas, or other methods described on this site—are approximations with meaningful uncertainty. They are intended for general education and personal progress tracking, not clinical decision-making.

Do not use FormCheck results to diagnose, treat, cure, or prevent any disease or health condition. Do not delay seeking professional medical care because of information on this site.

Speak with a physician, registered dietitian, or other qualified healthcare provider before starting any diet, exercise, or body composition program—especially if you:

• Have a chronic medical condition or take prescription medications
• Are pregnant, nursing, or planning pregnancy
• Have a history of eating disorders or disordered eating patterns
• Are under 18 years of age
• Experience unexplained weight change, fatigue, or other concerning symptoms

Consumer body fat methods—including AI photo estimation, bioelectrical impedance, skinfold calipers, and circumference formulas—typically carry ±3–8% error compared to clinical reference methods. Individual results may fall outside this range. FormCheck reports a range and confidence level to reflect this uncertainty.

For method-specific limitations, see our body fat measurement guide and how FormCheck works.

Charts, reference ranges, and articles on this site summarize publicly available sports medicine and public health references from organizations including the CDC, NIH, WHO, and ACSM. These summaries may be simplified and are not exhaustive. Reference ranges vary across sources and populations.

If you are experiencing a medical emergency, call your local emergency number immediately. FormCheck is not an emergency service.

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