Understanding Body Fat Percentage
Body fat percentage is a more useful health metric than weight or BMI alone. Two people can weigh the same but have vastly different body compositions — one might be muscular at 15% body fat while the other is at 30%. The US Navy method used here estimates body fat from circumference measurements. It is reasonably accurate (±3-4% compared to DEXA scans) and requires only a tape measure. For best results, measure first thing in the morning, pull the tape snug but not tight, and take 3 measurements of each site and average them.
Body Fat Categories and Health Risks
Essential fat (2-5% men, 10-13% women) is the minimum needed for basic physiological function — going below this is dangerous. Athletes (6-13% men, 14-20% women) maintain low fat for performance. Fitness range (14-17% men, 21-24% women) represents a healthy, active lifestyle. Average (18-24% men, 25-31% women) is typical for moderately active adults. Above 25% (men) or 32% (women) is classified as overweight and associated with increased health risks including cardiovascular disease, type 2 diabetes, and certain cancers. Reducing body fat by even 5% can significantly improve health markers.
Disclaimer: The US Navy method is an estimate. For precise body fat measurement, consider DEXA scan, hydrostatic weighing, or Bod Pod testing through a healthcare provider.