Army Body Fat Calculator
Estimate body fat using the official U.S. Army tape measurement method.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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This calculator uses the official U.S. Army tape test formula to estimate body fat percentage. The Army uses this method because it is quick, low-cost, and requires no special equipment. Here is how to measure correctly:
- Height. Measure barefoot, standing straight against a wall. Round to the nearest half-inch or whole centimeter.
- Neck. Measure circumference just below the larynx (Adam's apple), with the tape sloping slightly downward toward the front. Keep it snug but not compressing the neck.
- Waist. For males, measure at the navel. For females, measure at the narrowest point. Take the measurement while exhaling normally.
- Hip (females only). Measure around the widest part of the hips and buttocks with feet together.
- Enter age. The Army standards are organized into four age brackets. Your age determines the maximum body fat allowed.
About the U.S. Army Tape Test
The U.S. Army body fat assessment uses circumference-based formulas developed by Hodgdon and Beckett (1984) for the Naval Health Research Center. The formulas use logarithms of neck and waist (and hip for females) measurements divided by height to estimate body fat percentage.
Army maximum body fat standards vary by age and sex. Males aged 17 to 20 are allowed up to 20%, ages 21 to 27 up to 22%, ages 28 to 39 up to 24%, and ages 40 and over up to 26%. Female standards are 30%, 32%, 34%, and 36% respectively. Soldiers who exceed these limits face a mandatory weight control program (AWCP).
Frequently Asked Questions
How accurate is the Army tape test for body fat?
The Army tape test has a standard error of about 3 to 4 percentage points compared to DEXA scan measurements. It tends to overestimate body fat in people with muscular necks and underestimate in those with large waist-to-neck differences. Research published in the Journal of Strength and Conditioning Research found it less accurate than skinfold measurements but comparable to bioelectrical impedance for population-level screening. For individual assessments, DEXA scans remain the gold standard.
What are the Army body fat standards for each age group?
Army Regulation 600-9 sets maximum body fat by age bracket. For males: ages 17 to 20 = 20%, ages 21 to 27 = 22%, ages 28 to 39 = 24%, ages 40 and over = 26%. For females: ages 17 to 20 = 30%, ages 21 to 27 = 32%, ages 28 to 39 = 34%, ages 40 and over = 36%. Soldiers below these limits who still exceed the weight-for-height screening tables must pass the tape test to remain in compliance.
Why does the formula use logarithms?
The circumference-based body fat formulas use log10 of the measurement ratios because the relationship between circumference measurements and body density is not linear. Body fat distribution and the cross-sectional areas involved change non-linearly with circumference. The logarithmic transformation was chosen by Hodgdon and Beckett through regression analysis to minimize prediction error across a wide range of body sizes. The resulting formulas fit the measured body composition data better than a simple linear ratio would.
Can I use this calculator for the Air Force or Navy tape test?
The Army formula uses the same underlying Hodgdon and Beckett equations as the Navy Physical Readiness Test (PRT). The measurement procedures are very similar, though the Navy waist measurement is taken at the narrowest point rather than at the navel, and the standards (maximum body fat percentages) differ by branch. Air Force and Marine Corps tests use different methods. This calculator specifically implements the Army formula and Army standards as specified in AR 600-9.