How accurate is the US Navy body fat method?

The Navy formula is within 3-4% of DEXA (the gold standard) for most people. It is one of the most accurate field methods that does not require equipment. It tends to be less accurate at very low or very high body fat levels.

What is a healthy body fat percentage?

For men: athletes 6-13%, fitness 14-17%, average 18-24%, obese 25%+. For women: athletes 14-20%, fitness 21-24%, average 25-31%, obese 32%+. Women naturally carry more essential fat due to hormonal and reproductive needs.

Where should I measure my waist?

Measure at the narrowest point of your torso, typically at or just above the navel. Stand relaxed, exhale normally, and measure without sucking in. Consistent measurement location is key — small differences significantly change the result.

Lean mass (fat-free mass) is everything in your body except fat: muscle, bone, organs, water, and connective tissue. Knowing your lean mass helps track muscle gain or loss over time, especially during body recomposition.

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Body Fat % Calculator

Calculate your body fat percentage using the US Navy circumference method. Enter neck, waist, and hip measurements. Free body fat calculator for men and women.

Uses the U.S. Navy circumference method. Measure neck, waist, and hips in a relaxed standing position.

Height: 175cm

Neck: 37cm

Waist: 85cm

About This Tool

Estimate your body fat percentage using the US Navy circumference method — no calipers or equipment needed. Enter a few tape measurements for an accurate body fat estimate.