US Navy Body Fat Calculator – Accurate Body Composition Assessment Using NHRC Formula
About the US Navy Body Fat Calculator
This Navy Body Fat Calculator uses the official formula developed by the Naval Health Research Center (NHRC), San Diego, to estimate body fat percentage based on body measurements. It is widely recognized for its simplicity, accuracy, and application in both fitness and military contexts.
How It Works
The calculator estimates body fat percentage using anthropometric data—specifically height, neck, waist, and for women, hip circumference—along with age and sex. These inputs are processed using the NHRC-validated equations, different for men and women, and are based on logarithmic relationships between measurements.
Men’s Formula:
%BF = 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450Women’s Formula:
%BF = 495 / (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450
Why Use This Calculator?
No special tools required – just a tape measure.
Quick results – ideal for routine checks.
Field-tested accuracy – used by the U.S. Navy for service eligibility and fitness classification.
Tailored insights – based on sex-specific interpretations for better health guidance.
What the Result Tells You
Alongside your body fat percentage, the calculator gives you an interpretation of your body composition—such as essential fat, athlete range, fitness, average, or obese—and practical insights on how to improve your body fat level through exercise, nutrition, and lifestyle adjustments.
Is It Accurate?
While not as precise as DEXA or hydrostatic weighing, the Navy formula is one of the most reliable and validated methods available for general and field use. It’s a great option for fitness enthusiasts, professionals, and health practitioners looking for quick assessments.
Perfect For:
Gym members and trainers
Military personnel and candidates
Weight loss and fitness programs
Health assessments at home or in clinics