Army Body Fat Calculator
Estimate body fat percentage with the U.S. Army AR 600-9 tape (circumference) method — using neck and waist for men, plus hip for women — and see your body composition category.
How to Use
- Select your gender — the AR 600-9 formula differs for men and women.
- Enter your height in inches.
- Measure your neck just below the larynx (Adam's apple) and enter it in inches.
- Measure your waist at the navel, relaxed, and enter it; women also measure the hip at its widest point.
- Read your estimated body fat percentage and the resulting body composition category.
Show Work
Notes
About the Army Body Fat Calculator
The Army Body Fat Calculator is a simple, free helper for health and fitness tracking that runs entirely on your own device. Estimate body fat percentage with the U.S. Army AR 600-9 tape (circumference) method — using neck and waist for men, plus hip for women — and see your body composition category.
How it works
Enter your figures and the result appears instantly, updating the moment you change anything. There is no submit button and nothing to wait for, so it is easy to try a few what-if numbers and compare the results. Just check each box holds the kind of value it expects.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
How accurate is the Army tape method?
The AR 600-9 circumference method is a quick field estimate, not a lab measurement. It typically lands within a few percentage points of methods like DEXA or hydrostatic weighing for average builds, but can over- or under-estimate for very muscular or very lean people because it relies only on tape measurements, not actual fat mass.
Where exactly do I measure?
Measure the neck just below the larynx with the tape sloping slightly down to the front. Measure the waist at the level of the navel, relaxed (do not suck in). Women also measure the hips at the widest point of the buttocks. Take each measurement to the nearest half inch, relaxed and breathing normally.
What is the maximum allowable body fat in the Army?
Limits depend on age and gender and have been revised over the years. As a rough guide, allowable maximums rise with age — younger soldiers have stricter limits than older ones. Always check the current AR 600-9 standard for the exact figures, since this tool only estimates the percentage, not the pass/fail threshold.
Why does the formula use logarithms?
The AR 600-9 equations were derived by regression against laboratory body-fat measurements, and a log10 relationship between circumference, height, and body fat gave the best statistical fit. That is why neck, waist, and height are run through log10 rather than being added directly.
Is this medical advice?
No. This calculator is informational only and is not medical advice, a diagnosis, or an official military fitness determination. Body fat estimates vary by method. For health decisions or an official body-composition assessment, consult a qualified professional or your unit's standards.
How do I use the Army Body Fat Calculator?
Just type your numbers. The answer shows up right away — there is no button to press. Change anything and it updates by itself.
Does it cost anything or need an account?
No. The tool is completely free, there is no account to create, and it keeps working offline after the page first loads.
Is anything I type uploaded?
No. The tool works entirely on your device, so the values you enter never leave your browser.
Common Use Cases
Pre-test self-check
Estimate where you stand before an official Army body composition screening.
Tracking progress
Re-measure over weeks to see how diet and training move your tape body fat.
Comparing methods
Cross-check the tape estimate against scale or caliper body-fat readings.
Coaching clients
Give recruits or athletes a quick, equipment-free body composition estimate.
General fitness goals
Set a realistic body-fat target and track it without lab equipment.
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