Body Fat Calculator | Navy Method

About Body Fat Percentage

This calculator uses the US Navy method to estimate body fat percentage based on circumference measurements. While not as accurate as DEXA scans or hydrostatic (underwater) weighing, it provides a reasonable estimate, and home scales using bioelectrical impedance can differ noticeably from clinical methods. Using the American Council on Exercise (ACE) categories — Essential fat: 2–5% (men), 10–13% (women); Athletes: 6–13% (men), 14–20% (women); Fitness: 14–17% (men), 21–24% (women); Acceptable/Average: 18–24% (men), 25–31% (women); Obese: 25%+ (men), 32%+ (women). These are general fitness reference ranges, not a clinical diagnosis, and healthy ranges also shift with age. This information is for general reference and is not medical advice; consult a healthcare provider for an individual assessment.

Frequently Asked Questions

Q: Why do women have higher healthy body fat than men?

A: Women carry more essential fat, partly for hormonal and reproductive functions. That is why every category lists a higher percentage for women than for men.

Q: Is body fat percentage better than BMI?

A: It can give more insight because it distinguishes fat from muscle, which BMI cannot. However, it is harder to measure accurately at home, so the two are often used together.

Q: What is the most accurate way to measure body fat?

A: DEXA scans and hydrostatic (underwater) weighing are among the most accurate. Calipers and bioelectrical impedance are more convenient but less precise and can vary with hydration.