Army Body Fat Calculator
Estimate your body fat percentage with the US Army tape-test circumference method.
Example
A man who is 70 in tall with a 16 in neck and 34 in waist:
%BF = 86.010 x log10(34 - 16) - 70.041 x log10(70) + 36.76
= 86.010 x 1.2553 - 70.041 x 1.8451 + 36.76
= 15.5% body fat
How it works
Enter your height and circumference measurements in inches; men use neck and waist, women add hip. The calculator applies the Army's log-based formula to estimate body fat percentage.
Good to know
This tool estimates your body fat percentage using the US Army's circumference ("tape test") method, the same approach used to screen soldiers who exceed standard height and weight tables. You enter measurements in inches: men provide height, neck, and waist; women add a hip measurement. It is aimed at anyone curious how they would score under Army standards, plus general users who want a quick body composition estimate without a scale, calipers, or a clinic visit.
Reach for it when you want a no-equipment alternative to a bathroom body fat scale or a DEXA scan, or when you are preparing for a fitness assessment and want to know roughly where you stand. Because the formula relies only on a flexible tape measure, it is most useful for tracking change over time on yourself rather than comparing your number against someone else's.
The result shows an estimated body fat percentage plus a category label (Athletic, Fitness, Average, Above avg, or High) and a fat-mass-of-total note. Read the percentage as a ballpark, not a precise figure: the tape method tends to be least accurate for very lean or very muscular builds, and a single tight or loose pull of the tape can swing the number by a percentage point or more. Treat the category as the headline and the exact decimal as secondary.
For consistent results, measure relaxed (do not suck in your stomach), pull the tape snug but not compressed into the skin, and take each measurement two or three times to average out small errors. Re-measure at the same time of day under the same conditions when comparing across weeks, since meals, hydration, and posture all shift waist readings.
Frequently asked questions
How is the Army body fat method different from the Navy method?
Both use circumference (tape) measurements, but the Army formula uses slightly different coefficients. For men it is abdomen-based (waist minus neck) and for women it adds the hip measurement, much like the Navy method.
Where do I measure my waist for this calculator?
Men should measure the waist horizontally at the level of the navel. Women measure the waist at its smallest natural point and the hip at the widest point of the buttocks, all in inches.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser; nothing is uploaded.
Is this a substitute for medical advice?
No. These are educational estimates — consult a qualified health professional for medical decisions.
People also ask
What body fat percentage does the Army allow?
The Army's maximum allowable body fat varies by age and sex under its regulations, with limits that generally rise with age. This calculator gives you an estimate to compare against current standards but does not certify a pass or fail, since official screening uses controlled measurement procedures.
How accurate is the Army tape test for body fat?
The circumference method gives a reasonable estimate for average builds but can be off by several percentage points, especially for very muscular or very lean people. It measures girth, not actual fat, so it cannot distinguish muscle from fat at a given waist size.
What measurements do I need for the Army body fat calculator?
Men need height, neck, and waist; women need height, neck, waist, and hip. All values are entered in inches using a flexible tape measure.
Where exactly do I measure my neck for the tape test?
Measure the neck just below the larynx (Adam's apple), keeping the tape roughly level and snug without compressing the skin, while looking straight ahead. Rounding the neck measurement up is standard practice in the Army to avoid overestimating fat-free girth.
Why does the Army formula for women include the hip but not for men?
Body fat tends to distribute differently by sex, so the female equation adds the hip circumference to better capture that distribution. The male equation relies on waist minus neck because abdominal girth is the main variable for men.
Can I use centimeters instead of inches in this calculator?
This tool expects measurements in inches. If you have centimeter readings, convert them first by dividing by 2.54 before entering the values.
Is the Army method the same as the Navy body fat formula?
Both use tape measurements at similar sites, but they apply different coefficients, so the same measurements can produce slightly different percentages. The two methods are closely related but not identical.
What is considered a healthy body fat percentage?
General reference ranges differ by sex and age, with men typically lower than women at the same fitness level. These figures are population guidelines and not a personal medical assessment.
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