Body Fat % Calculator
Estimate body fat percentage using the US Navy method
Enter Details
kg
cm
cm
cm
cm
Required for females
Results
📏
Enter your measurements and click Calculate.
Formula
Men: 495 ÷ (1.0324 − 0.19077·log(waist−neck) + 0.15456·log(height)) − 450 Women: 495 ÷ (1.29579 − 0.35004·log(waist+hip−neck) + 0.22100·log(height)) − 450
- waist (cm) — Waist circumference at navel
- neck (cm) — Neck circumference below larynx
- hip (cm) — Widest point (women only)
- height (cm) — Standing height
Example: Male, 175 cm, waist 85 cm, neck 38 cm → ≈ 18.5% body fat
Interpreting Your Result
< 6%
Essential fat (men)
Physiological minimum
6–13%
Athletic (men)
Typical for competitive athletes
14–17%
Fitness (men)
Lean and healthy
18–24%
Acceptable (men)
Average range
≥ 25%
Obese (men)
Increased health risk
Frequently Asked Questions
What is a healthy body fat percentage?
For men: 6–24% depending on fitness level. For women: 14–31%. These ranges shift with age.
How accurate is the US Navy method?
Error margin of ±3–4%. Less accurate than DEXA but far more accessible. Consistent technique improves reliability.
How often should I measure?
Monthly is sufficient. Daily fluctuations from hydration can skew results. Measure at the same time of day.