Body Fat Percentage Calculator (U.S. Navy Method)
Estimate your body fat percentage using the measurement-based U.S. Navy method. Input your gender, height, neck, waist (and hip for females) measurements for an assessment.
Body Fat Calculation (Navy Method)
Your Estimated Results
Understanding Body Fat Percentage
Body fat percentage (BFP) represents the proportion of your total body weight that is fat. It's a more informative measure of health and fitness than weight or BMI alone, as it distinguishes fat mass from lean mass (muscles, bones, organs, etc.). (100-150 words)
U.S. Navy Method Formula
This calculator uses the U.S. Navy method formulas:
- Men: BFP % = 86.010 * log10(waist - neck) - 70.041 * log10(height) + 36.76 (Using cm)
- Men: BFP % = 86.010 * log10(waist - neck) - 70.041 * log10(height) + 30.30 (Using inches)
- Women: BFP % = 163.205 * log10(waist + hip - neck) - 97.684 * log10(height) - 78.387 (Using cm)
- Women: BFP % = 163.205 * log10(waist + hip - neck) - 97.684 * log10(height) - 104.912 (Using inches)
Note: These formulas provide an estimation and may not be perfectly accurate for all body types. (Include formula)
Understanding Fat Mass and Lean Mass
When you provide your weight, this calculator also computes:
- Fat Mass = Weight × Body Fat Percentage - The total weight of fat in your body
- Lean Mass = Weight × (1 - Body Fat Percentage) - The weight of everything else (muscle, bone, organs, etc.)
These values provide a more comprehensive picture of your body composition and can be useful for tracking fitness progress.
Factors Affecting Body Fat Percentage
Body fat is influenced by genetics, age, gender, diet, and activity level. Women naturally have a higher essential body fat percentage than men. As people age, muscle mass tends to decrease and fat mass increase. Consistent exercise and a balanced diet are key to managing body fat levels. (150-250 words)
Practical Advice
While calculators provide estimates, methods like DEXA scans offer more precise measurements. Focus on trends over time rather than single readings. Aim for a healthy body fat range through sustainable lifestyle changes, including strength training to build lean mass and a nutrient-dense diet. Consult healthcare or fitness professionals for personalized advice. (200-300 words)
Body Fat Percentage FAQs
How accurate is the U.S. Navy method?
The Navy method is reasonably accurate for average individuals but can have errors (±3-5%) compared to clinical methods. Accuracy depends heavily on correct measurement technique. It's best used for tracking changes over time. (50-80 words)
Why is body fat percentage important?
Knowing your BFP helps assess health risks associated with too much or too little body fat. High body fat is linked to conditions like heart disease and diabetes, while very low levels can also pose health risks. (50-80 words)
Can I lower my body fat percentage quickly?
Rapid fat loss is often unsustainable and can lead to muscle loss. Aim for gradual, steady fat loss (e.g., 1-2 lbs per week) through a combination of calorie deficit, resistance training, and adequate protein intake. (50-80 words)
What's the difference between BMI and Body Fat %?
BMI uses only height and weight, providing a general indicator of weight status. Body Fat Percentage specifically measures the proportion of fat mass, offering better insight into body composition and fitness level.
Where exactly should I measure waist, neck, and hips?
Neck: Below larynx. Waist: At navel level (men), narrowest point (women). Hips (women): Widest point. Ensure the tape measure is horizontal and snug but not tight. Refer to the tips section for details.
What are fat mass and lean mass?
Fat mass is the total weight of fat in your body, while lean mass includes everything else (muscles, bones, organs, water). Tracking these values over time can help you see if you're losing fat while maintaining muscle during a weight loss program.
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