Body Fat Calculator (Navy Method)

Estimate body fat percentage using the US Navy circumference method. See body fat category and lean body mass.
Sex
in
lbs
in
in

Body Fat Percentage

17.5%

Fitness

Fat Mass

31.5 lbs

Lean Body Mass

148.5 lbs

Male Body Fat Categories

Essential Fat2-5%
Athletes6-13%
Fitness14-17%
Average18-24%
Obese25%+

Calculated using the U.S. Navy body fat estimation method. This is an estimate and may not be accurate for all body types. Consult a healthcare provider for precise measurements.

Use the Body Fat Calculator (Navy Method) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

This calculator estimates your body fat percentage using the US Navy's circumference method, a widely recognized and simple technique. Understanding your body fat percentage is crucial for assessing overall health risks, as studies in 2026 continue to link higher body fat to increased prevalence of cardiovascular disease, type 2 diabetes, and certain cancers. It also helps in tracking fitness progress beyond just weight, offering a more nuanced view of body composition.

The Navy method utilizes specific body measurements to estimate body density, which is then converted into body fat percentage using the Siri formula. For men, the calculation involves neck and waist circumference, while for women, it includes neck, waist, and hip circumference. These measurements are logarithmically combined to derive an estimated body fat percentage.

Ensure all measurements are taken accurately and consistently, preferably by the same person and at the same time of day. Avoid taking measurements after strenuous exercise or large meals, as this can temporarily alter body dimensions. Remember that this is an estimation method, and while reliable, it may not be as precise as advanced laboratory techniques like DEXA scans.

Example: Calculating Body Fat for a 35-year-old Male

  1. 1 A 35-year-old male, 6 feet tall and weighing 190 lbs, takes his measurements. His neck circumference is 16 inches and his waist circumference is 34 inches.
  2. 2 Using the Navy Method formulas, the calculator first determines the circumference value: Waist - Neck = 34 - 16 = 18 inches. Then, it applies the logarithmic formula for men: 86.010 * log10(Waist - Neck) - 70.041 * log10(Height) + 36.76. Assuming a height of 72 inches, the calculation proceeds to estimate body density and then body fat percentage.
  3. 3 Based on these inputs, the calculator estimates a body fat percentage of 18.5%. This places him in the 'Fitness' category according to typical body fat percentage charts for men, which range from 14-20%. His lean body mass is calculated as 190 lbs * (1 - 0.185) = 154.95 lbs.
  4. 4 This result indicates a healthy body fat range for an adult male, suggesting a good balance of muscle and fat. Regular monitoring of these metrics can help him maintain his fitness goals and identify any significant changes in his body composition over time. If his goal was to be in the 'Athletic' category (6-13%), he would aim to reduce his body fat by approximately 5.5%.

Source: CDC · Last updated: April 2026

Frequently Asked Questions

What is a healthy body fat percentage?
For men: 10-20% is considered fit to healthy, 21-24% is acceptable, and above 25% is obese. For women: 18-28% is fit to healthy, 29-31% is acceptable, and above 32% is obese. Athletes are typically lower.
How does the Navy body fat method work?
The US Navy method estimates body fat using circumference measurements. For men, it uses neck and waist measurements. For women, it uses neck, waist, and hip measurements, combined with height in a logarithmic formula.
Is body fat percentage more useful than BMI?
Yes, body fat percentage is generally more informative because it measures actual fat tissue. BMI cannot distinguish between muscle and fat, so a muscular person may have a "high" BMI but low body fat. Body fat percentage is a better indicator of health risk.

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