Estimate your body fat percentage using the proven U.S. Navy formula. Understand your body composition and track your fitness progress.
Enter your measurements and click calculate to see your body fat results.
The U.S. Navy body fat formula is a circumference-based method developed by Hodgdon and Beckett at the Naval Health Research Center. It requires only simple tape measurements and produces results within 1–3% of clinical methods like DEXA scanning for most individuals.
Body fat percentage is the proportion of your total body weight that is composed of fat tissue. Unlike body weight alone, body fat percentage gives you a true picture of your body composition — distinguishing between essential fat, storage fat, muscle, bone, water, and organs. Understanding your body fat percentage is one of the most valuable metrics for assessing overall health, athletic performance, and long-term disease risk.
Your body stores fat in two main categories: essential fat and storage fat. Essential fat is required for normal physiological function — it cushions organs, insulates nerves, and supports hormone production. Storage fat accumulates under the skin (subcutaneous) and around organs (visceral) as an energy reserve. While some storage fat is perfectly healthy, excessive accumulation — especially visceral fat — is linked to cardiovascular disease, type 2 diabetes, and metabolic syndrome.
Body fat percentage is widely regarded as a superior metric to BMI (Body Mass Index) because BMI cannot distinguish between muscle mass and fat mass. A muscular athlete might have a "overweight" BMI while carrying an extremely healthy body fat level. Conversely, a sedentary individual with a "normal" BMI could have dangerously high body fat — a condition known as "skinny fat" or normal-weight obesity.
Excess body fat — particularly visceral fat stored around the abdomen — is a major risk factor for heart disease, stroke, type 2 diabetes, high blood pressure, certain cancers, and sleep apnea. Monitoring your body fat percentage helps you identify these risks early and take proactive steps. Even modest reductions of 3–5% body fat can significantly improve blood pressure, cholesterol levels, and insulin sensitivity.
For athletes and fitness enthusiasts, body fat percentage directly impacts performance. Lower body fat (within healthy ranges) typically improves speed, endurance, power-to-weight ratio, and agility. Bodybuilders, fighters, gymnasts, and endurance athletes all track body fat as a key performance indicator. However, going too low can impair recovery, immune function, and hormonal balance.
Research consistently shows that maintaining a healthy body fat percentage throughout life is associated with longer lifespan and reduced risk of chronic disease. The relationship between body fat and mortality follows a U-shaped curve — both very low and very high body fat percentages increase health risks. The optimal range varies by age and gender but generally falls in the "fitness" to "average" categories.
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athletes | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
These ranges are based on guidelines from the American Council on Exercise (ACE). Individual needs may vary based on age, genetics, athletic discipline, and health conditions. Women naturally carry higher body fat percentages due to biological requirements for reproductive function and hormone regulation.
Reducing body fat effectively requires a strategic combination of nutrition, exercise, and lifestyle modifications. Here are evidence-based strategies: