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Fitness & Health · Live

U.S. Army tape test, straight from AR 600-9.

Calculate your Army body fat percentage using the official tape test method. Plug in your gender, age, height, and circumference measurements and get an instant pass/fail against the AR 600-9 standard for your age group — for both genders, with the formulas the regulation actually uses.

Standards tableAR 600-9

Inputs

Tape test

Units

Gender

years
in
in

At the larynx, eyes forward

in

Around the navel, relaxed exhale

Age bracket
21 – 27
Max allowable
22%
Margin under cap
6.5 pp

Body Fat % · AR 600-9

Tape test · Navy circumference

15.5%

Max allowable for 21 – 27 · 22% · you are 6.5 pp under.

PassAR 600-9

Measurement guide

Where to place the tape

Round to nearest ½ in

Where

Neck

Just below the larynx, perpendicular to the long axis. Look straight ahead, do not flex.

Where

Waist (at navel)

Horizontal, level with the navel, on a relaxed exhale (do not suck in).

Where

Height

Measure barefoot against a wall, head level, taken to the nearest ¼ inch.

Men's formula uses two sites — neck + waist. Tape must be horizontal, snug, but not compressing the skin.

Formula

%BF = 86.010 · log10(waist − neck) − 70.041 · log10(height) + 36.76

Plugging in your numbers (inches): height = 70, neck = 16, waist = 34 → 15.5%.

Reference

Maximum allowable Army body fat standards by age

Per the Army Body Composition Program (AR 600-9), the maximum allowable body-fat percentage steps up with age. Soldiers above their bracket's ceiling are flagged for the program until they meet standards or are administratively separated.

Source · AR 600-9 (current)
AgeMax BF % (Male)Max BF % (Female)
17 – 20years20%30%
21 – 27years22%32%
28 – 39years24%34%
40+years26%36%

The age bracket is determined by your age in years on the day of the assessment. The standards apply to all components — Active, Reserve, and National Guard.

Field guide

How the AR 600-9 tape test actually works.

The Army's "tape test" is a circumference-based body-fat estimator adopted from the U.S. Navy method. Two sites for men, three sites for women. The arithmetic uses base-10 logarithms and runs in inches:

Men:   %BF = 86.010 · log10(waist − neck) − 70.041 · log10(height) + 36.76
Women: %BF = 163.205 · log10(waist + hip − neck) − 97.684 · log10(height) − 78.387

Where the tape goes (and where it doesn't)

  • Neck: wrap horizontally just below the larynx (Adam's apple), tape perpendicular to the long axis of the neck. Look straight ahead, do not flex your neck.
  • Waist (men): horizontal, level with the navel. On a relaxed exhale, do not "suck in." Multiple measurements are averaged in the regulation; the calculator takes whatever you enter as-given.
  • Waist (women): at the smallest natural waist circumference, between the rib cage and hipbones. Different site than men because the female formula uses hip + waist combined.
  • Hip (women only): horizontal around the widest part of the buttocks, heels together.
  • Height: barefoot against a wall, head level (Frankfurt plane). Round to the nearest ¼ inch.

Measurement technique that matters

Inconsistent technique is the largest source of error. Three rules to get repeatable numbers:

  • Snug, not tight. The tape should rest against the skin without compressing it. If you can see skin pressing through the tape edge, you've over-tightened.
  • Horizontal. Use a mirror or have someone check from behind that the tape isn't tilted on the back.
  • Three-measurement average. The regulation specifies three readings per site, averaged. If two readings differ by more than ½ inch, take a fourth.

Worked example: male, age 25, 70 in tall, 16 in neck, 34 in waist

  • waist − neck = 34 − 16 = 18 in
  • log10(18) ≈ 1.2553
  • log10(70) ≈ 1.8451
  • %BF = 86.010 × 1.2553 − 70.041 × 1.8451 + 36.76 ≈ 15.4%

The 21–27 male age bracket allows up to 22% , so this soldier passes with 6.6 percentage points of margin under the cap.

How accurate is the tape test?

Compared against hydrostatic weighing (the gold standard), the Navy circumference formula has a published error range of about ±3 percentage points for the typical adult. The Army adopted it because it's field-deployable and far cheaper than hydrostatic or DEXA. Two systematic biases the field literature identifies:

  • Heavily-muscled soldiers with thick necks tend to score lower than their actual body fat (good news for them).
  • Lean soldiers with disproportionate waist storage can score slightly higher than true body fat. This is rare in the active-duty population.

What happens if you fail

Per AR 600-9, a soldier who exceeds their age-bracket maximum is enrolled in the Army Body Composition Program. The program requires monthly progress assessments and counselling; soldiers must lose body fat at a minimum rate (typically 3–8 lb per month) until they meet standards. Failure to make satisfactory progress can lead to administrative separation. The standards apply to all components.

Tape test vs. body composition exemption

A soldier who exceeds the tape-test ceiling but passes the Army Combat Fitness Test with a high score may qualify for an ACFT exemption from the Body Composition Program — depending on current implementation of AR 600-9 and the unit commander's discretion. Always consult the latest regulation, your S-1, and your unit's policies for definitive guidance.

Disclaimer

This calculator implements the Navy circumference formula referenced in AR 600-9. It is not an official Army measurement. Real assessments require trained graders, calibrated equipment, and the regulation's three-measurement averaging procedure. Use this as a self-check between official assessments, not as a substitute for one.