Question 1

How accurate is the US Navy Body Fat method?

Accepted Answer

The US Navy method is estimated to be accurate within 3-4% of DEXA scans (the gold standard) for most of the population. While not perfectly precise, it is highly reliable for tracking changes over time and is vastly superior to standard BMI calculations, especially for muscular individuals.

Question 2

How do I measure correctly?

Accepted Answer

Use a flexible fiberglass or cloth tape. Keep the tape level and snug, but do not compress the skin.

• Neck: Just below the Adam's apple, keeping the tape horizontal.
• Waist (Men): Horizontally at the level of the navel (belly button). Don't suck your stomach in.
• Waist (Women): At the narrowest point of the abdomen, usually halfway between the lower rib and the hip bone.
• Hips (Women): At the widest outward extension of the hips/buttocks.

Question 3

Why do men and women have different formulas?

Accepted Answer

Men and women store body fat differently due to biological and hormonal differences. Men tend to store excess fat in the abdomen (visceral fat), while women typically store fat around the hips, thighs, and buttocks. Therefore, the female formula incorporates hip measurements to account for this physiological difference.

Question 4

What is Lean Body Mass (LBM)?

Accepted Answer

Lean Body Mass is everything in your body that is not fat. This includes your bones, organs, muscles, water, and connective tissues. Tracking your LBM is crucial during a diet to ensure you are losing fat, not hard-earned muscle.

Navy Body Fat Calculator

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