Body Fat Percentage Calculator

Enter your body measurements to get an accurate estimate of your body fat percentage and lean body mass.

Calculate

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Quick answer

Body fat percentage represents the total mass of fat divided by total body mass, multiplied by 100. It distinguishes between essential fat and storage fat. Unlike BMI, this metric provides a direct assessment of body composition, making it a critical indicator for fitness enthusiasts, athletes, and individuals monitoring metabolic health or obesity-related risks accurately.

Estimate your body fat using the US Navy Method.

Formula

Body Fat % = (Total Fat Mass / Total Body Mass) * 100 | U.S. Navy Method: uses waist, neck, and height (plus hips for women).

How It Works

**Waist**: Measure at the naval (belly button) for men, or the narrowest part of the torso for women. Tape should be level.
**Neck**: Measure just below the Adam's apple (larynx), sloping slightly downward to the front.
**Hips (Women)**: Measure at the widest part of the buttocks.
**Height**: Measure barefoot, standing straight.

Formula:

495 / (1.0324 - 0.19077 * log10(waist - neck) + 0.15456 * log10(height)) - 450

How It Works (Navy Method)

This calculator uses the **US Navy Method**, widely considered the most accurate way to estimate body fat without special equipment. It relies on the proportional difference between your waist/neck circumference and your height. ### The Logic - **Waist Measurement**: Indicates abdominal fat. - **Neck Measurement**: Estimates upper body structure; a thicker neck relative to waist often implies more muscle/less fat. - **Height**: Provides the baseline for body proportionality.

Common Mistakes

- **Sucking in the Stomach**: Measuring your waist while holding your breath in will give a falsely low fat percentage. Relax your abs. - **Wrong Neck Point**: Measuring too high on the neck exaggerates leanness. Measure lower down. - **Clothing**: Always measure against bare skin. Even thin shirts add centimeters.

Examples

Average Male: 178cm, 90cm waist, 38cm neck

Result: Result: ~19.5% (Average)

Athletic Female: 165cm, 68cm waist, 95cm hip, 34cm neck

Result: Result: ~22.4% (Fitness)

Elite Male Athlete: 180cm, 78cm waist, 41cm neck

Result: Result: ~10.2% (Athletic)

Lean Female: 170cm, 62cm waist, 88cm hip, 32cm neck

Result: Result: ~18.5% (Athletic)

Overweight Male: 175cm, 105cm waist, 39cm neck

Result: Result: ~28.4% (Obese)

Healthy Male: 182cm, 85cm waist, 37cm neck

Result: Result: ~16.8% (Fitness)

Senior Female: 160cm, 82cm waist, 105cm hip, 33cm neck

Result: Result: ~33.2% (Obese)

Tall Male: 195cm, 92cm waist, 42cm neck

Result: Result: ~15.5% (Fitness)

Petite Female: 155cm, 65cm waist, 90cm hip, 31cm neck

Result: Result: ~21.8% (Fitness)

Muscular Male: 178cm, 82cm waist, 44cm neck

Result: Result: ~12.1% (Athletic)

Active Female: 168cm, 72cm waist, 98cm hip, 35cm neck

Result: Result: ~24.5% (Fitness)

Large Frame Male: 185cm, 98cm waist, 43cm neck

Result: Result: ~20.5% (Average)

Post-Pregnancy Female: 165cm, 88cm waist, 110cm hip, 34cm neck

Result: Result: ~34.8% (Obese)

Young Male: 172cm, 80cm waist, 36cm neck

Result: Result: ~15.9% (Fitness)

Weight Loss Goal: 175cm, 95cm waist, 38cm neck

Result: Result: ~23.4% (Average)

Frequently Asked Questions

How accurate is the US Navy Method?

It is generally accurate within 1-3% for most people compared to hydrostatic weighing. It is far more accurate than BMI for athletes.

Why do women need a hip measurement?

Women store fat differently (hips/thighs) than men (abdomen). Including hips accounts for this biological difference in fat distribution.

What is a healthy body fat percentage?

For men, 10-20% is ideal. For women, 18-28% is healthy. Essential fat (required for life) is 2-5% for men and 10-13% for women.

Does this calculate visceral fat?

Indirectly, yes. Since it relies heavily on waist circumference, it is sensitive to abdominal (visceral) fat, which is the most dangerous type.

Key facts

Body fat percentage measures the proportionality of adipose tissue vs. lean body mass. Essential fat percentages differ by gender: 2-5% for men and 10-13% for women are necessary for physiological function. The U.S. Navy Method provides a reliable anthropometric estimation using circumference measurements. Lower body fat levels are associated with improved athletic performance and reduced risk of chronic metabolic diseases.

Trend & Behavior Analysis

As waist circumference increases while height and neck circumference remain constant, body fat percentage rises non-linearly. In women, hip circumference acts as an additional positive correlate. The formula is highly sensitive to abdominal measurements, reflecting the clinical importance of visceral fat distribution on overall health outcomes.