Body Fat Calculator
Estimate your body fat percentage using the US Navy method
Measurement Guide ▼
About Body Fat Calculator
Estimate your body fat percentage using the US Navy method. Get fat mass, lean mass, and fitness category — works for both men and women.
- Uses the US Navy circumference measurement method
- Calculates fat mass and lean mass separately
- Shows fitness category with visual rating
- Works for both men and women with different formulas
- Supports metric and imperial measurement inputs
Everything runs in your browser — your data never leaves your device.
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How to Use Body Fat Calculator
- Select your unit system and gender
- Enter height, weight, waist, neck (and hip for women)
- Click Calculate to see your body fat percentage and body composition
Frequently Asked Questions
How does the US Navy method work?
It uses circumference measurements (waist, neck, and hip for women) along with height to estimate body fat percentage using a logarithmic formula developed by the US Navy.
How accurate is this method?
The US Navy method has an accuracy of about +/- 3-4% compared to more precise methods like DEXA scans. It provides a good estimate for general fitness tracking.
Where should I measure?
Waist: at the navel for men, narrowest point for women. Neck: just below the larynx. Hip (women only): at the widest point of the buttocks.
