FREE TOOL — US NAVY METHOD

Body Fat
Calculator.

Estimate your body fat percentage using the US Navy circumference method — trusted by fitness professionals, coaches, and the military worldwide.

US Navy Formula (1984)
ACE Classification
Lean Mass · Fat Mass · BF%
PDF / Share Report

Enter Your Measurements

Fields marked * are required

Calculated in your browser — no data stored or shared.
How to measure correctly (tap to expand)

Neck: Measure just below the Adam's apple (larynx) with a slight downward slope at the front.

Waist (Men): Measure at the level of the navel — the widest part of the abdomen.

Waist (Women): Measure at the narrowest point between your ribs and hips.

Hip (Women only): Measure around the widest part of the buttocks.

📌 Take measurements on bare skin. Keep the tape horizontal, snug but not tight. Exhale normally before measuring.

📏 Measure just below the larynx (Adam's apple)
📏 Men: at navel level · Women: narrowest point between ribs & hips

US Navy Method · Hodgdon & Beckett 1984 · ACE Classification · Lean/Fat Mass

YOUR RESULTS
—
Body Fat %
—
Lean kg
—
Fat kg
Complete form above
—%
body fat percentage

WHAT YOU GET

📊
Body Fat %US Navy circumference estimate
🏋️
Lean MassMuscle, bone & organ weight in kg
🔥
Fat MassTotal body fat weight in kg
🏅
ACE ClassificationEssential · Athlete · Fitness · Obese
💡
Personalised TipsEvidence-based diet & exercise advice
📄
PDF ReportSave or share your full analysis

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BASED ON

Hodgdon & Beckett 1984US Navy circumference formula
ACE GuidelinesBody fat % classification chart
ACSM 2022Body composition standards
ISSN 2017Protein & body composition
NIN-ICMR 2024Indian nutrition guidelines

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⚕️ For educational purposes only. Not a substitute for professional medical or nutritional advice. The US Navy method has a margin of error of ±3–4% vs. DEXA. Results may vary based on hydration, measurement technique, and individual anatomy. Consult a qualified health professional for clinical body composition assessment. Designed for adults aged 18–80 only.