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ShapeUpAmerica.com is for informational purposes only. The calculators and tools provided are not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

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CalculatorsBody CompositionBody Fat Calculator
Verified Formula

Body Fat Calculator

Estimate body fat percentage via US Navy method.

Biometric Inputs

Real-time clinical computation active

Awaiting Data
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Enter biometric metrics to generate report

This assessment provides statistical probability and mathematical interpretation based on validated clinical equations. It is not a diagnostic tool.

Scientific Context

A non-invasive method to estimate total body fat percentage using circumference measurements and height.

Mathematical Formula

US Navy Fitness Formula

Behind the Math

The 'Navy' method was developed by Hodgdon and Beckett in 1984 at the Naval Health Research Center. It was designed to provide a low-cost, reliable way for the military to assess body composition without expensive underwater weighing (the standard at the time).

Expert Tip

Precision is everything for this tool. Use a non-stretch plastic tape and measure to the nearest 0.5cm. For the neck, measure just below the larynx (Adam's apple) for the most consistent baseline.

Primary Use
Health Screening
Standard
WHO Guidelines
Complexity
Clinical Grade

Frequently Asked Questions

Metric Recommendations

Lean Body Mass (LBM)

Calculate the mass of your body excluding fat.

BMI Calculator

Standard body mass index calculation with clinical classification.

Waist-to-Height Ratio

A simple indicator of abdominal obesity.

Waist-to-Hip Ratio

Evaluate body fat distribution.

Ideal Weight Calculator

Calculate recommended healthy weight.

Ideal Body Fat Range

Healthy body fat targets by age and gender.

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