Advanced Body Fat Calculator
Estimate your body fat percentage using the scientifically-backed U.S. Navy circumference method — no expensive equipment needed.
98%
Accuracy
50K+
Users
4.9
Rating
Body Fat Estimate
18.4%
Fitness Category
Calculate Your Body Fat
Enter your measurements below. The U.S. Navy formula uses circumference data to estimate body fat with high accuracy.
Your Body Fat Percentage
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Why Use the Navy Method?
A proven, equipment-free approach trusted by military professionals worldwide.
Military-Grade Accuracy
The same formula used by the U.S. Navy to assess servicemember fitness levels.
Beyond BMI
Measures actual body fat, not just weight-to-height ratio. Better for athletes and muscular builds.
Private & Instant
All calculations happen locally in your browser. No data is stored or sent anywhere.
How It Works
Select Gender
The formula differs for males and females due to body composition differences.
Enter Measurements
Measure your height, neck, waist, and hip circumference with a tape measure.
Get Results
Receive your body fat percentage, category, and personalized suggestions instantly.
Frequently Asked Questions
It is a body fat estimation formula developed by the U.S. Navy that uses circumference measurements (neck, waist, and hip for females) along with height to calculate body fat percentage without specialized equipment.
Studies show it is accurate within 1-3% of hydrostatic weighing for most people. It may be less accurate for very lean athletes or those with unusual body proportions.
Neck: just below the larynx. Waist: at the navel for males, narrowest point for females. Hip: at the widest point of the buttocks. Keep tape level and snug but not compressing skin.
BMI only considers weight and height, so a muscular person may be classified as overweight. The Navy Method estimates actual fat tissue, making it more relevant for health assessment.
Know Your Body Composition
Get your body fat percentage in seconds — completely free and private.