Body Fat Calculator

US Navy Method | Estimate body fat %, lean mass & healthy range

📐 Measure at narrowest point for waist, widest for hips, just below Adam's apple for neck
Estimated Body Fat Percentage
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Lean Body Mass
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Fat Mass
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Healthy Range
📊 Body Fat Category
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EssentialAverageObese

📖 How to Use This Body Fat Calculator

1
Select your gender - The calculator uses different formulas for men and women.
2
Enter your age and height - Age affects body fat distribution and healthy ranges.
3
Measure and enter circumferences - Neck, waist, and hips (women only) using a flexible tape measure.
4
Click "Calculate Body Fat" - Get your body fat percentage, lean mass, and category.

📏 How to Take Accurate Measurements

📚 What is the US Navy Body Fat Method?

The US Navy Body Fat Method is a circumference-based formula developed by the US Navy to estimate body fat percentage without expensive equipment. It's considered one of the most accurate non-invasive methods.

🧮 US Navy Body Fat Formulas

Men: BF% = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76
Women: BF% = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387

📊 Body Fat Percentage Categories

❓ Frequently Asked Questions

How accurate is the US Navy body fat method?
Studies show the US Navy method has an accuracy of about 3-4% compared to DEXA scans. It's considered the most accurate circumference-based method available.
What is a healthy body fat percentage for my age?
For men 20-39: 8-20%; 40-59: 11-22%; 60-79: 13-25%. For women 20-39: 21-33%; 40-59: 23-34%; 60-79: 24-36%.
Why do women have higher body fat percentages than men?
Women naturally carry more essential fat for childbearing, hormone regulation, and breast tissue.
How often should I measure my body fat?
Every 2-4 weeks is sufficient for tracking progress. Body fat changes slowly.
What is lean body mass?
Lean body mass is everything in your body except fat - including muscle, bones, organs, and water.