Why Body Fat Percentage Matters More Than Weight Alone
Body weight alone doesn't tell the full story of your health. Two people of the same height and weight can have very different health profiles depending on their ratio of muscle to fat. Body fat percentage is a far more informative metric because it distinguishes between lean mass (muscle, bone, organs) and fat mass. The US Navy method is a simple, widely-used anthropometric formula that estimates body fat from waist, neck, and (for women) hip circumferences alongside height. While not as accurate as DEXA scans or hydrostatic weighing, it provides a reliable estimate that can be tracked over time to monitor fitness progress and health risk.
Frequently Asked Questions
What is a healthy body fat percentage?
For men: 6–17% is the athletic to fitness range; 18–24% is average. For women: 14–24% is athletic to fitness range; 25–31% is average. Above 25% (men) or 32% (women) is considered obese by ACE guidelines.
How accurate is the US Navy method?
The US Navy method is accurate to within about 3–4% compared to DEXA scans. It's reliable for tracking changes over time. For precision (e.g., clinical or competitive use), DEXA or hydrostatic weighing is recommended.
Where should I measure my waist for this calculator?
For men: measure at the navel level. For women: measure at the narrowest point of the torso (natural waist). Take measurements relaxed, not sucking in, at the end of a normal exhale.