Calculate your body fat percentage using the US Navy method. Get fat mass, lean mass, and body composition analysis.
Body fat percentage is the proportion of your total body weight that consists of fat. It is considered a more accurate indicator of health than BMI because it distinguishes between fat mass and lean mass (muscle, bones, organs, water). Our body fat calculator online estimates your body fat percentage using measurements like height, weight, neck, and waist circumference.
Women naturally have higher essential body fat than men due to hormonal and reproductive needs. Body fat also tends to increase with age as metabolism slows and muscle mass decreases.
The most common methods include: Navy Method (using height, waist, and neck measurements — used in our calculator), DEXA scan (most accurate, uses X-ray), Hydrostatic weighing (water displacement, very accurate), Skinfold calipers (measures skin folds at multiple body sites), and Bioelectrical Impedance (used in smart scales, less accurate).
To effectively reduce body fat, combine a moderate calorie deficit (300-500 calories below TDEE) with strength training to preserve muscle mass. High-protein diet (1.6-2.2g per kg body weight) prevents muscle loss during fat loss. Include both cardio and resistance training for optimal fat loss results. Avoid crash diets as they cause muscle loss and metabolic slowdown.
Body fat percentage is more informative than BMI because it reveals what your body is actually made of. Two people can have the same BMI but very different body fat percentages — a muscular athlete and an overweight sedentary person. For fitness tracking, body fat percentage is the superior metric. BMI is better for quick population-level screening.
Body fat percentage can be estimated through several methods with varying accuracy and accessibility — skinfold calipers (measuring subcutaneous fat thickness at specific body sites), bioelectrical impedance (measuring how body tissue resists a small electrical current, since fat and muscle conduct differently), circumference-based formulas (using body measurements like waist, neck, and hip), and more precise clinical methods like DEXA scans or hydrostatic weighing, which are far more accurate but require specialized equipment.
Circumference-based formulas, like the US Navy method, offer a reasonable estimate using just a tape measure, making them accessible for regular self-tracking, though they trade some accuracy for convenience compared to clinical methods. Body fat percentage is generally considered a more meaningful health indicator than weight or BMI alone, since it distinguishes between fat mass and lean mass, which weight-based measures can't do.
Healthy body fat percentage ranges differ significantly between men and women due to biological differences in essential fat needed for hormonal and reproductive function, with women generally needing a higher minimum body fat percentage than men for healthy functioning. Athletic populations often maintain body fat percentages below the general population average, though extremely low body fat carries its own health risks, meaning "lower is always better" is not an accurate framing for this metric.
This calculator uses the US Navy method, which estimates body fat from body measurements. It's less accurate than DEXA scans or hydrostatic weighing but provides a good estimate for most people at home.
Healthy ranges vary by gender and age. For men: 2-5% (essential), 6-13% (athletic), 14-17% (fitness), 18-24% (average), 25%+ (obese). For women: 10-13% (essential), 14-20% (athletic), 21-24% (fitness), 25-31% (average), 32%+ (obese).
Females naturally carry more fat in the hip area. Including hip measurement in the formula provides a more accurate body fat estimate for women compared to using waist measurement alone.
BMI only considers weight and height, not body composition. Body fat percentage specifically measures the proportion of fat mass to total mass. A muscular person may have high BMI but low body fat.
To reduce body fat: create a calorie deficit through diet and exercise, prioritize protein intake, include strength training to preserve muscle, do cardio for additional calorie burn, get adequate sleep, and be consistent with your routine.
Body fat percentage depends on total body weight, not just fat mass alone. Enter your total weight and fat mass above to calculate the exact percentage.
Yes, this calculator uses standard measurement-based formulas to give a detailed body fat percentage estimate based on your inputs above.
