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Body Fat Percentage US Navy Calculator
Estimate body fat percentage, lean mass, and fat mass using official U.S. Navy circumference regression equations.
About the U.S. Navy Body Fat Model
The U.S. Navy circumference method applies logarithmic biometric regressions to approximate subcutaneous and visceral adipose distribution relative to lean mass.
Formulas
- Men: %BF = 495 / [1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)] - 450
- Women: %BF = 495 / [1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)] - 450
Frequently Asked Questions
Where should waist circumference be measured?
Men measure horizontally across the navel; women measure at the point of minimal abdominal circumference.
How accurate is this method compared to hydrostatic weighing?
When measured accurately, this method correlates within 3% to 4% of hydrostatic weighing and DEXA scans.
Does hydration skew circumference equations?
Yes. Significant abdominal bloating or glycogen water shifts alter circumference values.
What are healthy body fat targets?
Typical fitness ranges are 10% to 17% for men and 18% to 24% for women.
How to use
Calculate in three steps
- 1Enter your valuesUse the fields above and check the units shown beside each input.
- 2Run the calculationSelect Calculate to refresh the result with your latest values.
- 3Review or shareCompare the result, reset the form, print it, or share this page.
Inputs
What you need
Biological SexValue
Height (cm)cm
Neck Circumference (cm)cm
Waist at Navel (cm)cm
Hips at Widest (cm - Female only)cm
Total Body Weight (kg)kg