Army-Navy Body Fat Calculator
The U.S. Navy tape-measure method — the same one used by the Army for body-composition standards. It's accurate within ~3% for most adults and needs no calipers. Great cross-check when BMI flags a muscular build as overweight.
How to measure
- Neck: just below the larynx, tape sloping slightly downward.
- Waist (men): at the belly button, relaxed, not sucked in.
- Waist (women): at the narrowest part of the torso.
- Hip (women): around the widest point of the hips/glutes.
Body fat is one lens — pair with a weight target from the Quick Target Weight calculator.
Army body fat standards by age
The Army sets maximum body fat percentages by age and gender. Soldiers who exceed these limits must enter a body-composition program.
| Age group | Men max | Women max |
|---|---|---|
| 17-20 | 20% | 30% |
| 21-27 | 22% | 32% |
| 28-39 | 24% | 34% |
| 40+ | 26% | 36% |
The Navy uses a single maximum of 26% for men and 36% for women. These are maximums, not targets; the healthy range for the general public is usually lower.
Frequently asked questions
How does the Army calculate body fat?
The Army tape test uses neck and waist circumference for men, plus hip for women. The numbers are plugged into a log-based formula that estimates total body fat percentage.
Can a muscular person fail the Army tape test?
Yes. The tape test cannot distinguish muscle from fat, so very lean, muscular people can be classified as over the body-fat limit. If that happens, the Army allows a more precise test such as a DEXA scan.
What is the difference between the Army and Navy method?
The formulas are nearly identical, both based on the Navy circumference method. The main difference is the maximum body-fat standards: the Army uses age-graded limits, while the Navy uses a single limit of 26% for men and 36% for women.
Is this calculator a medical diagnosis?
No. This is an educational estimate only. For a true body-composition assessment or medical advice, consult a healthcare provider or military health professional.