How does this body fat calculator work?

This calculator uses the U.S. Navy method, which estimates body fat based on circumference measurements. It's a convenient way to track body composition changes without expensive equipment.

How accurate is the U.S. Navy method?

The U.S. Navy method is an estimation and can have a margin of error of 1-3% for most people. Its accuracy depends on taking the measurements correctly. It is best used for tracking changes over time rather than as a definitive diagnostic tool.

Where should I measure my waist, neck, and hips?

For best results: **Neck:** Measure below the larynx (Adam's apple). **Waist:** Measure at the narrowest point for women, and at the navel level for men. **Hips:** (Women only) Measure at the widest point of the hips/buttocks. Ensure the tape is level and snug but not tight.

Body Fat Calculator (U.S. Navy Method)

Your Body Fat Results

Body Fat Percentage

Body Fat Category

Fat Mass

Lean Mass

Body Fat Percentage Categories (ACE)

Understanding Body Fat Percentage

Your body fat percentage is the proportion of your total body weight that is fat. It is a more accurate indicator of health and fitness than Body Mass Index (BMI) because it distinguishes between fat mass and lean mass (muscles, bones, organs).

Tracking your body fat percentage over time is an excellent way to monitor your progress in a fitness or weight loss program. A decrease in body fat percentage, even if your total weight stays the same, indicates that you are losing fat and gaining muscle, which is a positive outcome.

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Frequently Asked Questions (FAQ)

How do I measure myself correctly?

For accurate results, use a flexible measuring tape and keep it level around your body. Don't pull it too tight.

Neck: Measure just below your Adam's apple, sloping slightly downward at the front.
Waist: For men, measure horizontally at the level of your navel. For women, measure at the narrowest point of your abdomen, usually just above the navel.
Hips (Women only): Measure at the largest horizontal circumference around your buttocks.

How accurate is this calculator?

The U.S. Navy method is a reliable estimation tool, typically with an accuracy of ±1-3% for most individuals. However, it is an estimate. For a definitive measurement, methods like DEXA scans are required. This calculator is best used to track your progress and changes over time.

Why doesn't this calculator use my age?

The U.S. Navy formula is unique in that it relies solely on body measurements and height to estimate body composition, unlike other formulas (like BMR) that include age as a factor. The relationship between the circumference measurements is used to predict density, from which body fat is derived.