How accurate is the Navy body fat method?

The U.S. Navy method is accurate within 1-3% for most people. It's the most reliable tape-measure method available and is used by the U.S. military for fitness assessments.

What is a healthy body fat percentage?

For men: 10-20% is considered fit, 6-13% is athletic. For women: 18-28% is fit, 14-20% is athletic. Essential fat is 2-5% for men and 10-13% for women.

Where should I measure my waist?

Measure at the narrowest point of your waist, typically at the navel level. Keep the tape snug but not compressing the skin. Measure in the morning before eating.

Navy method vs DEXA vs calipers — which is most accurate?

DEXA scan is the gold standard (±1-2%). The Navy circumference method is ±3-4% — the best free option. Calipers are ±3-5% but require trained administration. BIA scales are ±5-8% and heavily affected by hydration. For tracking trends over time, the Navy method is consistent and reliable.

How often should I measure body fat?

Measure every 2-4 weeks under the same conditions: morning, fasted, before exercise. More frequent measurements create noise from water retention fluctuations. Track the trend over 8+ weeks rather than any single reading.

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Body Fat Calculator

Estimate your body fat percentage using the US Navy method

Gender

Height (inches)

Neck Circumference (in)

Waist at Navel (in)

This body fat calculator uses the U.S. Navy circumference method to estimate your body fat percentage from neck, waist, and hip measurements. The Navy method is validated to within 3-4% of DEXA scan results and requires only a tape measure — no calipers or expensive equipment.

Frequently Asked Questions

For men: 10-20% is the healthy range (athletes 6-13%, fitness 14-17%, average 18-24%). For women: 18-28% is healthy (athletes 14-20%, fitness 21-24%, average 25-31%). Essential fat minimums are 2-5% for men and 10-13% for women — going below these levels is dangerous.

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NinjAthlete is a performance optimization platform publishing evidence-based guides on HYROX training, peptide therapy, biohacking, and longevity science. HYROX content is informed by sub-60 competition experience (59:51, HYROX Dallas). Peptide content cites peer-reviewed research with DOI/PubMed links.

Last reviewed: April 2026|Editorial Policy

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