Body Fat Calculator
Calculate body fat percentage, lean muscle mass, and fat categories using the US Navy Method.
Input Parameters
Live Result
Details
Quick Answer & Understanding Your Result
Your Body Fat Percentage represents the proportion of total body mass composed of adipose fat tissue relative to lean muscle, bone, and water.
US Navy Circumference Method
- Men: Uses neck and abdomen (waist at navel) circumferences along with height.
- Women: Uses neck, waist (narrowest point), and hip (widest point) circumferences along with height.
Healthy Body Fat Percentage Ranges (ACE Guidelines)
- Essential Fat: 2–5% (Men) | 10–13% (Women) — required for physiological survival.
- Athletes: 6–13% (Men) | 14–20% (Women) — peak athletic conditioning.
- Fitness: 14–17% (Men) | 21–24% (Women) — lean, athletic lifestyle.
- Average / Acceptable: 18–24% (Men) | 25–31% (Women) — healthy population range.
- Obesity: 25%+ (Men) | 32%+ (Women) — elevated metabolic and cardiovascular risks.
Measure your neck, waist, and hip circumferences with a tape measure and enter the values above to calculate your exact body fat percentage.
Formula & Calculation Logic
Mathematical FormulaLogarithmic formulas developed by Hodgdon and Beckett at the Naval Health Research Center.
Step-by-Step Guide
Select Biological Sex
Choose Male or Female (measurement landmarks differ).
Measure Circumferences
Measure neck, waist (at navel), and hips (women only) in cm or inches.
Input Standing Height and Weight
Enter current height and scale weight.
Review Body Composition Breakdown
View your body fat %, total fat mass (kg/lbs), and lean mass.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Fit Male (178cm, 75kg, Waist 82cm, Neck 38cm) | Calculated via US Navy male logarithmic formula. | ||
| Female (165cm, 60kg, Waist 70cm, Hip 96cm, Neck 34cm) | Calculated via US Navy female formula including hip circumference. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Naval Health Research Center - Hodgdon & Beckett Body Composition Study
American Council on Exercise (ACE) - Body Fat Norms
Standard: WHO Adult BMI Diagnostic Standard
Formula: Men: %BF = 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450
Last Reviewed: August 21, 2026
Primary Source: Naval Health Research Center - Hodgdon & Beckett Body Composition Study
Reference Document: American Council on Exercise (ACE) - Body Fat Norms
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated health, metabolic, and biometric metrics are for general fitness and educational reference only. They do not substitute for professional medical advice, clinical diagnosis, or personalized treatment plans.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.