Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy circumference method.
About Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method — no scales or calipers needed. Enter your neck, waist, and (for women) hip measurements along with height to get an estimated body fat % and fitness category.
Use Cases
Tracking fat loss progress without body fat scales, fitness assessment, military fitness requirements, understanding body composition.
How It Works
US Navy formula: Men: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. Women: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387.
Frequently Asked Questions
How accurate is the Navy method?
Typically within 3–4% of DEXA scan results for most people. It is a good tracker for progress but not as precise as clinical methods.
Where do I measure waist circumference?
Measure at the navel (for men) or at the narrowest point of the waist (for women). Keep the tape horizontal and snug but not tight.