U.S. Navy & Army Body Fat Calculator
Calculate body fat percentage and lean mass using the official U.S. Navy and Army AR 600-9 circumference tape test formula.
Calculated using the official U.S. Navy & Department of Defense circumference equations.
U.S. Navy & Army Body Fat Standards (DoD / AR 600-9 Tape Test)
The U.S. Navy Body Fat Formula (developed by Hodgdon and Beckett at the Naval Health Research Center) is the official circumference-based method mandated by the Department of Defense (DoD Instruction 1308.3) and the U.S. Army Body Composition Program (AR 600-9). It uses precise anatomical circumferences (neck, abdominal waist, and hip for females) relative to height to estimate total fat mass and lean body mass within ±3% accuracy of hydrostatic underwater weighing and DEXA scans.
Official Measurement Protocol
- Neck Circumference: Measured directly below the larynx (Adam's apple), perpendicular to the long axis of the neck with shoulders relaxed.
- Waist Circumference (Males): Measured horizontally at the level of the navel (belly button) at the end of normal exhalation.
- Waist Circumference (Females): Measured horizontally at the narrowest point of the natural torso.
- Hip Circumference (Females only): Measured horizontally across the maximal protrusion of the gluteal muscles.
Army AR 600-9 Maximum Allowable Body Fat Limits by Age
| Age Group | Male Standard Max | Female Standard Max |
|---|---|---|
| Ages 17 – 20 | 20% | 30% |
| Ages 21 – 27 | 22% | 32% |
| Ages 28 – 39 | 24% | 34% |
| Ages 40+ | 26% | 36% |
Reviewed against peer-reviewed primary sources by the TDEEmacro Editorial Team · Last reviewed 2026-08-24
Formulas and clinical thresholds on this page are grounded in peer-reviewed primary literature and established physiological standards. Always consult a registered dietitian or physician before changing your dietary or exercise protocol.
- U.S. Navy circumference body fat equation Hodgdon JA, Beckett PR. Prediction of percent body fat for U.S. Navy men and women from body circumferences and height. Naval Health Research Center Reports No. 84-29 and 84-11; 1984.
- DoD Instruction 1308.3 & Army AR 600-9 Department of Defense. DoD Physical Fitness and Body Fat Programs Procedures. DoD Instruction 1308.3; 2002 (Updated AR 600-9).
Frequently Asked Questions
How accurate is the U.S. Navy body fat calculator formula?
The U.S. Navy circumference method (Hodgdon & Beckett, 1984) is accurate within ±3% of hydrostatic underwater weighing and DEXA scans when measurements are taken strictly according to DoD standards.
What is the Army AR 600-9 tape test standard?
Army Regulation 600-9 establishes maximum allowable body fat percentages by age: 20% (ages 17-20), 22% (21-27), 24% (28-39), and 26% (40+) for males, and 30%, 32%, 34%, and 36% for females.
How do I take exact neck and waist measurements?
Measure neck circumference directly below the larynx with shoulders relaxed. Measure male waist horizontally at the navel at the end of a normal exhale. Females measure waist at the narrowest point and hips at the widest point of the gluteals.