Estimate your body fat percentage with the classic US Army tape test — the traditional multi-site circumference formulas from AR 600-9 — and see instantly whether you pass the longstanding Army standard for your age group. All you need is a tape measure.
Army body fat standards by age group (longstanding AR 600-9)
Age group
Men max
Women max
17–20
20%
30%
21–27
22%
32%
28–39
24%
34%
40+
26%
36%
📌 Classic multi-site AR 600-9 formulas; the Army’s official 2023 update uses a one-site abdominal method. Circumference estimates are typically within ±3–4 percentage points of DEXA. For self-assessment only — official taping is done by trained personnel.
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The formulas (classic AR 600-9 tape test)
The traditional Army method estimates body fat from circumference measurements in inches using logarithmic equations:
Worked example: a male soldier who is 70 inches tall with a 36-inch abdomen and 16-inch neck: 86.010·log₁₀(20) − 70.041·log₁₀(70) + 36.76 = 111.9 − 129.2 + 36.8 ≈ 19.5% body fat — a pass in every age group. Note that in June 2023 the Army switched official taping to a simplified one-site abdominal method; the multi-site formulas above are the classic version this calculator implements.
How to take the measurements
Height — without shoes, heels together, looking straight ahead.
Neck — just below the larynx (Adam’s apple), tape sloping slightly downward to the front, without pressing into the skin.
Abdomen (men) — level with the navel, at the end of a normal, relaxed exhale. No sucking in.
Waist (women) — at the narrowest point of the torso, typically midway between the ribs and the hip bones.
Hip (women) — around the largest protrusion of the buttocks, tape level with the floor.
Take each measurement three times and average the readings. Compared with a DEXA scan, the tape is usually within ±3–4 percentage points — good enough to track direction, not lab-grade. For a civilian estimate with the closely related Navy method, try the body fat calculator, and to plan the calorie side of getting under the standard, the TDEE calculator shows your daily energy burn.
Frequently asked questions
Circumference-based estimates are typically within ±3–4 percentage points of a DEXA scan for most body types. The method is least accurate at the extremes: very muscular soldiers with thick necks can measure artificially low, while lean people who carry fat at the waist can measure high. The Army chose the tape test for consistency and field practicality, not laboratory precision.
Soldiers who exceed the body fat standard are enrolled in the Army Body Composition Program (ABCP). Enrollment brings mandatory nutrition counseling, monthly re-taping, and a flag that blocks promotions, awards, and attendance at military schools until the standard is met. Repeated failure to make satisfactory progress can lead to separation from the Army.
Both use circumference measurements and logarithmic formulas, but the Navy method includes height together with neck and waist in a different equation (and uses hip for women as well), producing slightly different results from the same tape numbers. The classic Army AR 600-9 formulas shown here use abdomen-minus-neck for men and waist-plus-hip-minus-neck for women. Always test against the standard of your own branch.
Popular tricks — dehydration, fasting, waist trainers, holding a hard flex — change the tape number by a fraction of an inch at most, and dehydrating before a fitness event is genuinely dangerous. The measurement protocol (relaxed, at the end of a normal exhale) is designed to defeat flexing and sucking in. The only reliable way to pass is actual fat loss through sustained diet and training.
Yes. In June 2023 the Army moved to a simplified one-site method that estimates body fat from a single abdominal circumference measurement, replacing the traditional multi-site formulas for official taping. This calculator uses the classic multi-site AR 600-9 formulas, which remain the best-known version and are still widely used for self-assessment and by other services with similar methods.
Cite this calculator
APACalcBrew. (2026). Army Body Fat Calculator. https://calcbrew.com/army-body-fat-calculator
MLA“Army Body Fat Calculator.” CalcBrew, 2026, calcbrew.com/army-body-fat-calculator.
Link to https://calcbrew.com/army-body-fat-calculator. Results are estimates; cite the underlying formula or data source for academic work.