Body Fat Calculator
Determine your body fat percentage using the verified US Navy circumference method. Learn your fat mass weight, skeletal lean mass, and fitness category.
Body Metrics
Visual Gauge
Body Mass Breakdown
- Total Fat Mass --
- Lean Body Mass --
Secondary Comparisons
- BMI-based Body Fat --
- Calculated BMI Score --
Body Fat Categories (ACE Standards)
Male Ranges
- Essential Fat: 2 – 5%
- Athletes: 6 – 13%
- Fitness: 14 – 17%
- Average: 18 – 24%
- Obese: 25%+
Female Ranges
- Essential Fat: 10 – 13%
- Athletes: 14 – 20%
- Fitness: 21 – 24%
- Average: 25 – 31%
- Obese: 32%+
How to Take Tape Measurements:
- Neck: Measure just below the larynx (Adam's apple), sloping slightly downward toward the front. Keep neck relaxed.
- Waist: For men, measure horizontally at the navel level. For women, measure at the narrowest point of the torso.
- Hips (Female only): Measure horizontally at the widest circumference of the buttocks.
How to Use the Body Fat Calculator
Estimate your percentage of muscle mass vs fat tissues using a tape measure:
- Select your preferred Unit System: Metric (cm/kg) or Imperial (inches/lbs).
- Select your biological Gender. The US Navy uses different formula offsets by gender.
- Enter your Age, Height, Weight, Neck, and Waist circumferences using the sliders.
- (If female) Enter your Hip circumference using the hip slider.
- Click Calculate Body Fat to view your body fat percentage, health category, lean mass breakdown, and a gauge indicator.
The Navy Circumference Formula
The equations require logarithmic math, measuring all circumferences in centimeters:
This method is trusted for general physiological monitoring because body fat correlates highly with torso and abdomen circumferences compared to general weight alone.
Frequently Asked Questions
How does the US Navy body fat calculator work? ↓
The US Navy method estimates body fat percentage using circumferences of the neck, waist, and height (plus hips for women). It is a highly accurate tape-measure method verified against hydrostatic weighing.
What are normal body fat percentages for men and women? ↓
Normal average body fat is 18-24% for men and 25-31% for women. Women naturally require higher essential body fat levels (10-13%) compared to men (2-5%) for reproductive health.
How is the BMI method of body fat estimation calculated? ↓
The BMI method uses a formula based on your Body Mass Index, age, and gender. It is a secondary approximation that may not account for muscle mass as well as the tape measure method.
Where should I measure my waist and hip circumferences? ↓
For men, measure waist horizontally at the navel. For women, measure waist at the narrowest point and hips at the widest point of the buttocks.
How can I reduce my body fat percentage? ↓
Reducing body fat requires a combination of a caloric deficit (eating fewer calories than you burn), strength training to preserve muscle mass, and regular cardiovascular activity.