Estimate your total body fat percentage using the U.S. Navy Method or the BMI Method. For the most accurate results, measure to the nearest ¼ inch (0.5 cm).
How to Use
- Select your gender and enter your age.
- Input your weight (in pounds or kilograms) and height (in feet/inches or centimeters).
- Measure and enter:
- Neck circumference (below the larynx, tape sloping downward).
- Waist circumference:
- Men: Measure horizontally at the navel.
- Women: Measure at the smallest width.
- Women only: Hip circumference (widest point).
- Click Calculate to view your results.
Body Fat Calculator
US Units
Metric Units
Body Fat: —
| Body Fat (U.S. Navy Method) | — |
| Body Fat Category | — |
| Body Fat Mass | — |
| Lean Body Mass | — |
| Body Fat (BMI method) | — |
Results Explained
- Body Fat Percentage (U.S. Navy Method): Estimates fat using neck, waist, and (for women) hip measurements.
- Body Fat Category: Compares your result to fitness standards (Essential, Athlete, Fitness, Average, Obese).
- Fat Mass & Lean Mass: Breaks down fat vs. muscle/other tissue.
- Ideal Body Fat (Jackson & Pollock): Shows the recommended fat percentage for your age.
- BMI Method Estimate: Alternative calculation using BMI, age, and gender.
Understanding Body Fat
- Essential Fat: Minimum required for health (2–5% men, 10–13% women).
- Storage Fat: Excess fat, which can increase health risks if too high.
- Health Risks: Obesity is linked to heart disease, diabetes, and other conditions.
Measurement Methods
- U.S. Navy Method: Uses waist, neck, and hip (women) measurements.
- Men:BFP=86.010×log10(waist−neck)−70.041×log10(height)+36.76BFP=86.010×log10(waist−neck)−70.041×log10(height)+36.76
- Women:BFP=163.205×log10(waist+hip−neck)−97.684×log10(height)−78.387BFP=163.205×log10(waist+hip−neck)−97.684×log10(height)−78.387
- BMI Method: Estimates fat based on BMI, age, and gender.
- Men:BFP=1.20×BMI+0.23×Age−16.2BFP=1.20×BMI+0.23×Age−16.2
- Women:BFP=1.20×BMI+0.23×Age−5.4BFP=1.20×BMI+0.23×Age−5.4
Accuracy Notes
These calculations are estimates. For precise measurements, consider professional methods like:
- Bioelectrical Impedance Analysis (BIA)
- Hydrostatic Weighing
- DEXA Scan
Body Fat Categories
| Classification | Women | Men |
|---|---|---|
| Essential Fat | 10–13% | 2–5% |
| Athletes | 14–20% | 6–13% |
| Fitness | 21–24% | 14–17% |
| Average | 25–31% | 18–24% |
| Obese | 32%+ | 25%+ |
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