FREE Calculator
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy tape method using neck, waist, and hip measurements. Get fat mass, lean mass, and category.
Body Fat Calculator
Enter your measurements to estimate body fat percentage
Your Result
Enter your measurements to see body fat
Estimated body fat %, fat mass, and lean mass
How to Measure Correctly
- •Measure on bare skin with a flexible tape, level and snug but not compressing.
- •Neck: just below the larynx (Adam's apple).
- •Waist: at the navel, relaxed — don't suck in.
- •Hip (women): at the widest point of the hips.
- •Take each measurement two or three times and average to reduce error.
Understanding Body Fat Categories
Essential fatMen 2–5% · Women 10–13%
AthletesMen 6–13% · Women 14–20%
FitnessMen 14–17% · Women 21–24%
AverageMen 18–24% · Women 25–31%
ObeseMen 25%+ · Women 32%+
Note: The U.S. Navy method is typically accurate to within 3–4% of a DEXA scan for most people — reliable for tracking changes over time.
Important Notes
Tape-measure methods estimate body fat and work best for tracking change over time with consistent technique. They are not a medical diagnosis. This calculator is for educational purposes only.