Question 1

What is the most accurate way to measure body fat?

Accepted Answer

The most accurate methods are DEXA scan, hydrostatic weighing, and Bod Pod. The US Navy method used in this calculator is a low-cost at-home alternative with reasonable accuracy (±3-4%) when measurements are taken carefully. For medical decisions consult a professional.

Question 2

How does the US Navy body fat formula work?

Accepted Answer

The US Navy method uses circumference measurements (neck, waist for men; neck, waist, hip for women) plus height to estimate body density, which is then converted to body fat percentage using the Siri or Brozek equation. The formulas differ slightly for men and women.

Question 3

What is a healthy body fat percentage?

Accepted Answer

For men: 6-24% is generally healthy (athletes 6-13%, fitness 14-17%, average 18-24%). For women: 16-31% (athletes 14-20%, fitness 21-24%, average 25-31%). Values outside these ranges can be associated with health risks.

Question 4

Is this body fat calculator private?

Accepted Answer

Yes. All calculations run in your browser. No data — measurements, weight or results — is ever sent to a server, stored or shared.

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