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Body Fat Calculator
Estimate body fat percentage and lean body mass using standard waist, neck, and hip circumference measurements.
About the Navy Body Fat Formula
The U.S. Navy circumference method provides a cost-effective, non-invasive method for estimating body composition and relative fat mass without expensive DEXA scans.
Measurement Technique
- Neck: Measure below the larynx, with tape sloping slightly downward.
- Waist (Men): Measure horizontally around the navel during normal exhalation.
- Waist (Women): Measure at the narrowest natural abdominal point.
- Hips (Women): Measure around the widest portion of the buttocks.
Frequently Asked Questions
How accurate is the US Navy method?
Studies indicate accuracy within 3% to 4% of dual-energy X-ray absorptiometry (DEXA) when measurements are recorded precisely.
What is considered an athletic body fat range for men?
Typical athletic ranges are 8% to 14% for men and 14% to 20% for women.
What is essential body fat?
Essential body fat required for physiological and neurological survival is roughly 2% to 5% in men and 10% to 13% in women.
Can hydration impact tape measurements?
Yes. Water retention and digestive bloating can temporarily expand abdominal circumference readings.
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
GenderValue
Total Weight (kg)kg
Height (cm)cm
Neck Circumference (cm)cm
Waist Circumference (cm)cm
Hip Circumference (cm - Female only)cm