🇺🇸 US Army AR 600-9 🇬🇧 British Army 🇦🇺 ADF Australia 🇨🇦 Canadian Forces
Army Body Fat Calculator
Calculate body fat percentage using the US Army circumference method (AR 600-9). This tape measurement method is used by the US Army, Navy, Marine Corps, and Coast Guard — and compares differently to how the UK, Australia, and Canada assess military fitness.
Quick Answer
US Army uses waist, neck (and hip for women) measurements to calculate body fat %. Limits: men ≤20–26% (age-dependent); women ≤30–36%. UK Army uses BMI + fitness test, not body fat %. Australia uses waist-to-height ratio. Canada uses BMI. The US method (Hodgdon & Beckett, 1984) is one of the only militaries using circumference-based body fat calculation.
Below the larynx
At narrowest point
Military Body Composition Standards by Country
| Military | Method | Standard |
|---|---|---|
| 🇺🇸 US Army (AR 600-9) | Circumference method (waist, neck, hip) | Men ≤20–26%, Women ≤30–36% (age-dependent) |
| 🇺🇸 US Navy / USMC | Same circumference method | Similar to Army with branch-specific limits |
| 🇬🇧 British Army | BMI + fitness test (APFA) | BMI 18.5–32; no body fat % standard |
| 🇦🇺 Australian ADF | Waist-to-height ratio + fitness test | Waist-to-height < 0.5 for most roles |
| 🇨🇦 Canadian Armed Forces | BMI (17–33) + fitness test (EXPRES) | BMI range + Physical Fitness Test |
| 🇩🇪 German Bundeswehr | BMI + annual fitness test | BMI 18–30; fitness test by service branch |
| 🇯🇵 Japan Self-Defense | BMI + physical fitness test | BMI 17.5–25 for new recruits |
Frequently Asked Questions
How do I measure neck circumference for the Army body fat test? ▾
Measure neck circumference just below the larynx (Adam's apple), keeping the tape horizontal and close to the skin but not compressing it. For men: the measurement is taken at the narrowest point of the neck, just below the larynx. For women: measure at the mid-neck, below the larynx. Round measurements down to the nearest 0.5 inch (or 1 cm). Consistent measurement technique significantly affects accuracy.
How accurate is the Army circumference method? ▾
The US Army circumference method (Hodgdon & Beckett, 1984) has a standard error of approximately ±3–4% body fat when compared to hydrostatic weighing. It systematically underestimates body fat in muscular individuals and may overestimate in individuals with different fat distribution patterns. The US Army has used this method since the 1980s because it requires only a tape measure, is fast to administer, and can be applied in field conditions worldwide.