Calculate your body fat percentage, lean body mass and fitness category using the U.S. Navy circumference method.
Enter your height, weight, neck, waist and (for women) hip circumference measurements.
Instantly estimate your body fat percentage using the U.S. Navy method.
See your fitness category, lean body mass and personalized health tips.
Body fat percentage is the proportion of your total body weight that consists of fat tissue, as opposed to lean mass such as muscle, bone, organs and water. Unlike BMI, body fat percentage gives a more direct measure of your body composition, making it a useful metric for tracking fitness progress and overall health.
Body fat percentage measures fat mass directly, unlike BMI which only considers height and weight.
Tracking body fat over time can help distinguish between fat loss and muscle gain during training.
| Category | Women | Men |
|---|---|---|
| Essential Fat | 10%–13% | 2%–5% |
| Athletes | 14%–20% | 6%–13% |
| Fitness | 21%–24% | 14%–17% |
| Average | 25%–31% | 18%–24% |
| Obese | 32% and above | 25% and above |
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
Measurements are in inches. This calculator automatically converts metric inputs before applying the formula. The Navy method is one of the most accessible and widely used circumference-based body fat estimation techniques.
A Body Fat Calculator estimates the percentage of your body weight that comes from fat using simple circumference measurements. This calculator uses the U.S. Navy method, a widely used and accessible technique that only requires a measuring tape rather than specialized equipment like calipers or DEXA scans.
Whether you're tracking fitness progress, planning a body recomposition goal or simply curious about your body composition, this calculator provides a reliable estimate along with your lean body mass and fat mass breakdown.
While BMI only considers height and weight, body fat percentage measures actual body composition. This makes body fat percentage a more precise indicator for athletes and muscular individuals, who may register a high BMI despite having low body fat. Using both metrics together provides a more complete picture of overall health.
A quick screening tool based only on height and weight, without distinguishing fat from muscle.
A more direct measure of body composition, useful for tracking fitness and fat loss progress.
This Body Fat Calculator provides an estimate based on the U.S. Navy circumference method. Results can vary based on measurement accuracy and individual body composition, and may differ from clinical methods like DEXA scans or hydrostatic weighing. Please consult a qualified healthcare professional for a precise assessment.
A Body Fat Calculator estimates the percentage of your body weight that comes from fat using circumference measurements like neck, waist and hips.
The Navy method is generally accurate within a few percentage points compared to lab methods, making it a reliable and accessible estimate for most people.
Healthy ranges vary by gender, but generally 14%-24% for men and 21%-31% for women fall within the fitness to average categories.
The Navy method formula for women includes hip circumference because body fat distribution patterns differ between men and women.
Yes. This calculator is completely free and works on desktop, tablet and mobile devices.
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