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This calculator is for informational and educational purposes only.
- Not Medical Advice: The information provided does not constitute medical advice, diagnosis, or treatment.
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Body Fat Calculator
Calculate your body fat percentage using the US Navy method or BMI estimation. Get accurate body composition analysis including lean body mass and fat mass. Supports both metric (cm, kg) and imperial (inches, lbs) units. 100% free and private.
US Navy Method
Accurate body fat calculation using proven circumference measurements.
Body Composition
Get detailed breakdown of lean mass and fat mass.
100% Private
All calculations happen locally. Your data never leaves your device.
Body Fat Categories
Men
Essential Fat
Minimum fat required for survival
Athlete
Typical range for athletes
Fit
Fit and healthy range
Average
Typical healthy range
Obese
Above healthy range
Women
Essential Fat
Minimum fat required for survival
Athlete
Typical range for athletes
Fit
Fit and healthy range
Average
Typical healthy range
Obese
Above healthy range
Frequently Asked Questions
What is body fat percentage?
Body fat percentage is the proportion of fat in your body compared to your total body weight. It includes essential fat (needed for survival) and storage fat. Unlike BMI, body fat percentage directly measures body composition and is a better indicator of health and fitness.
What is the US Navy method?
The US Navy method calculates body fat percentage using circumference measurements (neck, waist, and hip for females) along with height. This method is widely used and considered more accurate than BMI-based estimations. It was developed by the U.S. Navy to assess body composition.
What is a healthy body fat percentage?
For men, a healthy range is 14-24% (Fit to Average). For women, 21-31% (Fit to Average). Athletes may have lower percentages (6-13% for men, 14-20% for women). Essential fat (2-5% for men, 10-13% for women) is the minimum needed for survival. Anything below essential levels is dangerous.
How do I measure my circumferences?
Use a flexible measuring tape. Neck: Measure below the larynx (Adam's apple). Waist (men): Measure horizontally at navel level. Waist (women): Measure at the narrowest point. Hip (women only): Measure at the widest point. Stand relaxed and ensure the tape is snug but not tight.
Which method is more accurate?
The US Navy method is more accurate than BMI estimation. The Navy method uses actual body measurements, while BMI estimation uses only height and weight with an assumed age. For best results, use the Navy method with precise measurements.
Is my data private?
Absolutely. All calculations happen in your browser. Your measurements and body fat data never get sent to any server, ensuring complete privacy and security.