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Tool: Body Fat Calculator — US Navy Circumference Method | Printed on:
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Body Fat Calculator — US Navy Circumference Method
Estimate your body fat percentage and lean mass using circumference measurements.
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BIOMETRIC HEALTH
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Body Measurements (Navy Method)
US Navy Body Fat Equation
Transparent mathematical methodology explained in plain English.
Men: 495 / (1.0324 - 0.19077·log₁₀(waist - neck) + 0.15456·log₁₀(height)) - 450 Uses logarithmic ratios of circumference measurements to estimate body density and body fat percentage.
Variables Explained:
- waist, neck, hip: Tape measurements in centimeters or inches.
- height: Stature in centimeters or inches.
Real Project Example
Male 70" height, 34" waist, 15.5" neck
Navy method evaluation.
Sample Project Inputs:
Height: 70 in
Waist: 34 in
Neck: 15.5 in
Step-by-Step Calculation:
- Waist - Neck: 34 - 15.5 = 18.5 inches.
- Evaluate logarithmic equation.
- Calculated body fat: ~16.5%.
Calculated Answer: 16.5% Body Fat (Fitness / Athletic classification).
Knowledge Base
Frequently Asked Questions: Body Fat Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Where should measurements be taken?
Measure neck circumference just below the larynx, waist horizontally at the navel for men (narrowest point for women), and hips at the widest point of the buttocks.