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Body Fat Percentage Calculator — U.S. Navy Method — Calculator

Calculate your body fat percentage using the U.S. Navy circumference method. Uses neck, abdomen (men), and waist/hip (women) measurements with anatomical.

✓ Formula verified: January 2026For informational purposes only
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Body Fat Calculator

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years
ft
in
in / cm
in / cm
Body Fat Percentage (U.S. Navy Method)
24.0%

Fitness Category

Average

Fat Mass (24.0% of body weight)

40.8 lbs

Lean Mass (76.0% of body weight)

▲ 129.2 lbs

Essential Fat Threshold

▲ < 6% (Male) — < 14% (Female)

Athletic Range

6–14%

What if your age changes? 27 years → 24.0% · 30 years → 24.0% · 33 years → 24.0%

Scenario Comparison

Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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BMI CalculatorArmy Body FatLBM CalculatorOverweight Risk
Body Fat Classification & Measurement Guide
CategoryMen (% BF)Women (% BF)You
Essential Fat2–6%10–14%—
Athletic6–14%14–21%—
Fitness14–18%21–25%—
Average18–25%25–32%—
Obese25%+32%+—
Measurement Instructions

For most accurate results: use a non-stretchable tape measure. Measure in the morning before meals. Take each measurement twice and average them. Have someone else measure you if possible.

Neck

Measure just below the larynx (Adam's apple). Tape should be perpendicular to the neck, not angled down. Pull snug but not tight.

Abdomen (Men)

Measure at the level of the navel. Relax your stomach (do not suck in). Measure after exhaling normally.

Important Disclaimer

The U.S. Navy circumference method provides an estimate of body fat percentage with a standard error of ±2–3%. This is not a clinical diagnostic tool. Body composition measurements should be interpreted in context with other health indicators. Consult a healthcare provider, registered dietitian, or certified fitness professional for a comprehensive body composition assessment. Extremely low body fat (below essential fat levels) can impair hormonal function, immune response, and bone density.

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