Body Fat Calculator (Navy Method)
Calculate your estimated body fat percentage, lean body mass, and fat mass using circumference measurements.
Select & Measure
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Enter your circumferences and standard measurements on the left to review your body composition report.
The Science Behind U.S. Navy Body Composition Method
Developed by the U.S. Navy Research Center, this algorithm utilizes specific body circumferences to estimate body fat percentage. It offers a convenient, non-invasive alternative to hydrostatic weighing or DEXA scans with a reasonable margin of accuracy (typically ±3-4%).
Reference Ranges for Men & Women (Jackson & Pollock / ACE standards)
| Classification | Men Range (%) | Women Range (%) |
|---|---|---|
| Essential Fat | 2 – 5% | 10 – 13% |
| Athletes | 6 – 13% | 14 – 20% |
| Fitness | 14 – 17% | 21 – 24% |
| Average | 18 – 24% | 25 – 31% |
| Obese | 25%+ | 32%+ |
Frequently Asked Questions
Why does female body fat percentage require hip measurement?
Gynoid fat distribution (storing fat around hips and thighs) is highly characteristic of female physiology. The Navy equation includes hip circumference for females to accurately reflect this anatomical fat storage pattern.
How should I measure neck and waist circumferences?
Neck: Measure just below the larynx, keeping the tape horizontal. Waist: Measure at navel level for males and at the narrowest waistline for females. Use a flexible measuring tape and don't pull too tight.