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Health & Fitness US Navy Method

Body Fat Calculator

Estimate your body fat percentage, lean body mass, and fat mass using the clinically validated US Navy circumference method.

Biological Sex
Body Fat Estimate Fitness
15.7%

Fitness

Total Fat Mass 11.8 kg
Lean Muscle & Tissue Mass 63.2 kg
Total Scale Weight 75 kg

Understanding Body Composition

Body composition divides total body weight into two fundamental categories: fat mass and fat-free mass (lean mass). While standard scale weight and BMI cannot determine whether weight fluctuations are due to water retention, muscle hypertrophy, or adipose fat, body fat percentage provides an exact measure of physical fitness.

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US Navy Body Fat Equations

Men: 495 / [1.0324 - 0.19077×log10(waist - neck) + 0.15456×log10(height)] - 450

Where:

  • waist - neck = Circumference difference in centimeters
  • height = Stature in centimeters

Note: For women, hip circumference is added to waist circumference before subtracting neck circumference.

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Frequently Asked Questions

Common questions and clear answers about this calculator

The US Navy circumference method is an anthropometric formula developed by the Department of the Navy (Hodgdon and Beckett, 1984) to accurately estimate body composition based on the ratio of neck, waist, and hip circumferences relative to stature.