Estimate body fat percentage using the U.S. Army circumference (tape) method — instantly check whether you meet AR 600-9 standards.
Results update live as you type.
Estimated Body Fat (Army Tape Test)
Body Fat
16.5%
measured
Army Max
22%
age 21-27
Result
PASS
AR 600-9
Margin
5.5%
below max
| Age band | Male max | Female max |
|---|---|---|
| 17 – 20 | 20% | 30% |
| 21 – 27 | 22% | 32% |
| 28 – 39 | 24% | 34% |
| 40 + | 26% | 36% |
The Formula
The U.S. Army uses a circumference-based body fat estimate adopted from research by Hodgdon and Beckett at the Naval Health Research Center. For men it relies on neck and waist; for women it adds hip. All values are taken in inches. AR 600-9 defines age- and sex-specific maximum percentages a soldier must meet.
Hodgdon–Beckett (used by AR 600-9)
About This Tool
The Army body fat calculator — also known as the Army tape test calculator or AR 600-9 calculator — estimates body fat percentage using only a measuring tape and a few simple circumferences. It is the exact method the U.S. Army uses to screen soldiers for the Army Body Composition Program, including basic-training screening, promotion boards, and PHA assessments.
The math behind it is the Hodgdon–Beckett equation, developed at the Naval Health Research Center in the 1980s. Although it is a circumference-based estimate (not a gold-standard DEXA scan), studies have shown it correlates reasonably well with measured body fat for adults in service-age ranges. Our calculator implements the formula exactly as published, with no shortcuts or rounding tricks.
After computing your body fat, the tool compares it to the AR 600-9 maximum percentages for your age and sex and tells you whether you would pass or fail the tape test today, plus your margin in either direction.
Every calculation runs in your browser — nothing is sent to a server. Whether you are an active-duty soldier, ROTC cadet, recruit prepping for ship-out, or just curious how you would do against military standards, this free online Army body fat calculator gives you the answer in seconds.
Official AR 600-9
Uses the Army's regulation Hodgdon–Beckett formula and maximum standards.
Imperial & Metric
Enter measurements in inches or centimetres — auto-conversion built in.
Live Results
Tap, drag, or type — body fat, max, and pass/fail update instantly.
Pass / Fail Display
See not just your BF% but whether you meet the standard for your age & sex.
Visual Gauge
A colour scale shows where your BF% sits across fitness bands.
100% Private
All math runs locally in your browser. No sign-up, no tracking.
A few honest tape measurements give you your AR 600-9 result in seconds.
Toggle Imperial (in) or Metric (cm), then select male or female. Female adds a hip measurement.
Age determines which AR 600-9 band applies. Height should be measured without shoes, standing straight against a wall.
Wrap the tape around your neck just below the Adam's apple. Keep it horizontal, snug but not compressing skin. Round up to the nearest half-inch.
For men, measure at the navel. For women, measure at the narrowest point of the abdomen. Tape parallel to the floor; round down to the nearest half-inch.
Wrap the tape around the widest part of the hips and buttocks, parallel to the floor. Round down to the nearest half-inch.
Your BF%, age-band maximum, and pass/fail status update live. The margin tells you how far above or below the limit you are.
Everything you need to know about the Army tape test, AR 600-9, and how to pass.
It's a tool that replicates the U.S. Army's official body-composition screening method described in AR 600-9. You enter a few circumference measurements (height, neck, waist, and hip for females) and it estimates body fat percentage using the Hodgdon–Beckett equation, then compares the result to the Army's age- and sex-specific maximum standards.
AR 600-9 maximum body fat by age band: Male — 17–20: 20%, 21–27: 22%, 28–39: 24%, 40+: 26%. Female — 17–20: 30%, 21–27: 32%, 28–39: 34%, 40+: 36%. Recruits and soldiers must be at or below these percentages to be considered compliant.
The tape must be a non-stretching flexible measuring tape, kept horizontal, and tight enough to lie flat but not to indent the skin. Neck is measured just below the larynx; waist at the navel (males) or narrowest point (females); hips at the widest point. Per AR 600-9, three measurements are taken at each site and averaged. Round neck up and waist/hip down to the nearest half inch.
Common reasons: measurement technique differences (how snug the tape is held, exact landmarks chosen), rounding conventions (the Army rounds neck up and waist/hip down to the nearest 0.5″), water weight or recent meals, or your unit using slightly different reference tables. Our calculator uses the exact published Hodgdon–Beckett equation and the standard AR 600-9 maximums.
The Hodgdon–Beckett equation has a standard error of roughly ±3.5% body fat compared to laboratory hydrostatic weighing. It tends to overestimate body fat for very muscular, wide-necked individuals and underestimate body fat for soldiers with smaller frames who carry abdominal fat. For most service members it is a fair, repeatable, and low-cost screen — which is why the military uses it.
Soldiers who exceed the body fat standard are flagged into the Army Body Composition Program (ABCP). They receive nutrition and exercise counselling, get monthly weigh-ins, and must show measurable progress. Continued failure can lead to bars to reenlistment and ultimately separation under AR 600-9. Recruits who fail will not ship for basic training until they meet the standard.
Since the formula is dominated by waist circumference, the fastest changes come from reducing abdominal fat: a modest calorie deficit (400–600 kcal/day), high protein (1.6–2.2 g/kg), strength training to preserve muscle, and consistent zone-2 cardio. Cutting alcohol and refined carbs accelerates abdominal fat loss. Many soldiers see 1–2″ off the waist in 6–8 weeks of disciplined eating.
Yes. When you select female a hip measurement field appears, and the calculator switches to the female Hodgdon–Beckett formula: BF% = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387. The maximum standards also automatically switch to the female AR 600-9 bands.
Yes — toggle to the Metric (cm) tab and the labels switch. The formula is defined in inches, so the calculator converts your centimetre values to inches before applying the equation. The result is identical to entering the same height/neck/waist directly in inches.
Yes, but the method changed. Army Directive 2023-11 (published June 12, 2023) replaced the multi-site tape test with a one-site abdominal tape test that uses abdominal circumference at the navel and body weight. This calculator uses the earlier multi-site Hodgdon–Beckett method (neck, waist and, for women, hips) from AR 600-9, so treat its result as an estimate. Your official result comes from the current one-site Army calculator used by your unit.
The Navy, Marines, and Air Force all use circumference-based body fat methods derived from the same Hodgdon–Beckett research, but each service has its own maximum standards and slightly different rounding/measurement conventions. The Army-specific maximums (and the male formula using only neck and waist) shown in this calculator are unique to AR 600-9.
This calculator is intended for screening, training preparation, and self-monitoring. It is not a medical diagnosis. For comprehensive body composition (DEXA, BodPod, hydrostatic weighing) or for health concerns related to weight, consult a doctor or registered dietitian. If you have a pending official tape test, your unit's measurer's reading is the authoritative one.
This tool gives general health and fitness estimates. It is not medical advice, diagnosis or treatment. Talk to a doctor or registered dietitian before acting on the results, especially if you are pregnant, under 18 or managing a medical condition.
Spotted an error or out-of-date figure? Tell us. We review every report and correct confirmed mistakes promptly.