ReckonBoxWhat this page does
The US Army caps body fat by age and sex under AR 600-9, and measures it with a single abdominal tape measurement. Enter your weight and abdominal circumference for the current one-site figure, your age and sex for the standard you have to clear, and your ACFT score to find out whether you're exempt from the tape test altogether.
Two things here are worth more than the percentage itself. The ACFT exemption removes the tape from the picture entirely, and the accuracy section below puts a number on how far this measurement can be from the truth, which the calculators ranking for this term do not.
The standards
| Age | Male | Female |
|---|---|---|
| 17 to 20 | 20% | 30% |
| 21 to 27 | 22% | 32% |
| 28 to 39 | 24% | 34% |
| 40 and over | 26% | 36% |
Maximum allowable percent body fat, from AR 600-9. The allowance loosens with age and sits six points higher for women in every band.
The exemption most people miss
A record ACFT of 540 or more, with at least 80 points in each of the six primary events, exempts a soldier from the circumference assessment entirely. That comes from Army Directive 2023-08, and alternate ACFT events don't qualify for it.
Both conditions have to hold together. A 560 total with one event at 70 doesn't exempt you, and neither does 80 in every event adding up to 520.
It's the most actionable fact on this whole search, and it removes the tape from the picture rather than helping you pass it.
The tape test changed in 2023, and it takes two numbers
The Army replaced its multi-site tape test with a single measurement under Army Directive 2023-11. After a twelve-month transition the one-site method became the sole authorised circumference-based method in June 2024.
The protocol is precise. Abdominal circumference at the navel, tape parallel to the floor, taken at the end of a normal relaxed exhalation, three readings averaged and recorded to the nearest half inch, with weight to the nearest pound.
The current equations use only those two measurements, weight and abdominal circumference:
- Men: %BF = -26.97 - (0.12 x weight in lb) + (1.99 x abdomen in inches)
- Women: %BF = -9.15 - (0.015 x weight in lb) + (1.27 x abdomen in inches)
So a 180 lb man taping 34 inches comes out at 19.1%, against a 24% standard at age 30.
Height is gone. It was in the retired equations and it is not in these, which is why a tall soldier and a short one at the same weight and waist now get the identical figure.
Weight counts eight times more for men
Look at the weight coefficients: 0.12 for men, 0.015 for women. Adding 20 lb at an unchanged waist moves a man's result by 2.4 points and a woman's by 0.3.
Since weight enters negatively, gaining muscle without gaining waist lowers the reported figure. That is the intended behaviour, and it also means the number can be moved by things that have nothing to do with body fat.
Where these coefficients came from
Worth stating plainly, because the sourcing is not clean. Army Directive 2023-11 and every army.mil host refuse automated requests, so the coefficients here are not read from the directive itself. They come from peer-reviewed work quoting it: a 2025 paper on Army accession and retention standards publishes both equations, and an independent calculator publishes the male equation identically.
An earlier version of this page carried no percentage at all, because five attempts to reach the directive failed and we would not guess at numbers that can decide a career. That was the right call then and the sourcing has since improved.
How accurate is the tape, really
Against DXA, the one-site equation carries a mean absolute error of 4.1 percentage points and limits of agreement of 9.5 points. Its constant error is 0.1 ± 5.2 points, so on average across a group it is close to unbiased.
The average is not the interesting part. The same evaluation found substantial proportional bias, with slope coefficients from -0.08 to -0.48, meaning the equation reads differently depending on where you actually sit: it drifts at both the lean and the heavy ends, which are precisely the ends where a pass or fail is decided.
That is why this page prints a band rather than a single number.
It is worse at detecting change than at describing a state
A study following recruits through eight weeks of basic training compared circumference against DXA and found the tape underestimated body fat by about 6 percentage points in both sexes at the outset.
Tracking the change was worse than that:
| DXA measured | Circumference reported | |
|---|---|---|
| Women | -4.0% body fat | 0.0% ± 3.3% (p = 0.86) |
| Men | -3.3% body fat | -2.2% |
Circumference did not detect the change in women at all. Only 56% of women and 83% of men were correctly classified as having gained or lost fat, and 43% of women showed a body fat gain by tape while actually losing fat by DXA.
For a measurement attached to career consequences, that asymmetry is the single most important thing on this page, and no calculator ranking for this term mentions it.
Meanwhile, one ranked calculator is still serving the retired method
Omni Calculator publishes the multi-site equations as current, citing AR 600-9 from July 2019 and AR 40-501 from June 2019, with no mention anywhere on the page of the 2023 change.
- Men: %BF = 86.010 x log10(waist - neck) - 70.041 x log10(height) + 36.76
- Women: %BF = 163.205 x log10(waist + hip - neck) - 97.684 x log10(height) - 78.387
Those are real equations and they were the Army standard until 2024. A soldier who lands there today gets a number from a method that no longer exists, presented as though it counts.
This tool still computes that figure in its advanced fields, labelled as retired, for one reason: anyone who finds that number on another site deserves to see what it is and how far it sits from the current method. It has no official standing and the Army will not accept it.
The number of record is still not this one
This reproduces the Army's equation, and it is not the Army's measurement. The figure that goes in your record comes from a trained grader taping you and the Army's own calculator, run through the Army Resilience Directorate.
That distinction matters more here than the arithmetic. Given a half-inch difference in where the tape sits moves a man's result by about a point, and given the error band above, the gap between this and your record is dominated by the measuring rather than the maths.
If you're near the line, the height and weight screen comes first anyway: soldiers within the screening table never get taped at all.
Results on this page are estimates and general information, not medical or personnel advice. Body composition questions that affect your service belong with your chain of command and, where health is involved, a doctor. For general body composition outside the Army context, the body fat calculator covers the standard methods and the body shape calculator covers waist-to-hip ratio.
Frequently asked questions
What is the Army body fat standard for my age? AR 600-9 sets maximum allowable body fat at 20% for men and 30% for women aged 17 to 20, 22% and 32% for ages 21 to 27, 24% and 34% for ages 28 to 39, and 26% and 36% from age 40. The standard loosens with age and sits six points higher for women in every band.
How does the Army one-site tape test work? A single abdominal circumference is measured at the navel, with the tape parallel to the floor, at the end of a normal relaxed exhalation. Three readings are taken, averaged, and recorded to the nearest half inch, alongside body weight rounded to the nearest pound. It replaced the multi-site method under Army Directive 2023-11 and became the sole authorised circumference method in 2024.
How is the current Army body fat percentage calculated? From two measurements only: body weight in pounds and a single abdominal circumference in inches. For men the equation is -26.97 minus (0.12 times weight) plus (1.99 times abdomen); for women it is -9.15 minus (0.015 times weight) plus (1.27 times abdomen). A 180 lb man taping 34 inches comes out at 19.1 percent. Height is not used, which is a change from the retired multi-site method.
Can I skip the tape test? Yes, with a strong ACFT. Under Army Directive 2023-08, scoring 540 or more on the record ACFT with at least 80 points in each of the six primary events exempts a soldier from the circumference-based assessment entirely. Alternate ACFT events do not qualify for the exemption.
What was the old multi-site tape test? It measured neck and waist for men, adding the hip for women, and ran them through log-based equations. Men used 86.010 log10(waist minus neck) minus 70.041 log10(height) plus 36.76. The Army retired it in 2024, though at least one top-ranked calculator still serves it as current while citing regulations from 2019.
Does the retired estimate on this page count for anything? No. It carries no official standing and the Army will not accept it. It appears here because a reader who finds that number on another calculator deserves to see what it is, and because comparing it against the current one-site figure shows how much the change in method moved the result.
Sources
- US Army accession and retention standards (publishes both current one-site equations)
- Evaluation of the US Army one-site method against DXA (the 4.1 point error and the proportional bias)
- Body composition change over eight weeks of military training (where circumference missed the change)
- calculator.net army body fat calculator (AR 600-9 standards table and the one-site method)
- BodySpec, guide to the new one-site tape test (the ACFT exemption and what changed)
- GigaCalculator army body fat calculator (citing Army Directive 2023-11)
- Omni Calculator army body fat (the retired multi-site equations, still served as current)