Estimate body fat percentage using the US Navy method. Free calculator.
This body fat percentage tool lets you estimate your body fat percentage using the US Navy circumference method. It is designed for speed and accuracy, running entirely in your browser with no data sent to any server. Whether you are a student, professional, or simply need a quick answer, this calculator provides instant results with clear explanations. Enter your height, waist, neck, and hip circumferences. The calculator uses the US Navy body fat formula, which is a well-validated anthropometric method that estimates body fat percentage from simple tape measurements. While less precise than methods like DEXA scans, it provides a reasonable estimate for tracking changes over time.
Enter your height, waist, neck, and hip circumferences. The calculator uses the US Navy body fat formula, which is a well-validated anthropometric method that estimates body fat percentage from simple tape measurements. While less precise than methods like DEXA scans, it provides a reasonable estimate for tracking changes over time.
Fitness enthusiasts track body composition changes over training cycles. Athletes monitor body fat percentage for sport-specific performance targets. Military personnel prepare for body composition assessments. Personal trainers establish baseline measurements for new clients. Health-conscious individuals track body fat as a complement to scale weight.
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Yes, this Body Fat Percentage calculator is completely free with no signup, no account creation, and no usage limits. All calculations run locally in your browser, so your data stays private and results appear instantly.
This calculator uses standard mathematical formulas and internationally recognized conversion factors. Results are displayed with up to six significant digits of precision. For most everyday uses, the results are more than accurate enough.
Yes, the calculator is fully responsive and works on smartphones, tablets, and desktop computers. The interface automatically adjusts to your screen size. Touch inputs and on-screen keyboards work seamlessly.
Once the page has loaded in your browser, the calculator works without an internet connection. All computation happens locally using JavaScript. Bookmark the page for quick access anytime.
This calculator uses standard, well-established formulas that are widely accepted in education, science, and professional practice. The specific formula is explained in the "How it works" section above.