Calculate body fat percentage using the US Army circumference method based on neck, waist, height and (for women) hip measurements.
This tool estimates body fat percentage using the U.S. Army's tape-test method, which relies on circumference measurements (neck, waist, and for women, hips) rather than skinfold calipers or scans. It's commonly used to check compliance with military body composition standards.
The Army method uses circumference-based equations (derived from the U.S. Navy method) that differ slightly for men and women. For men: Body Fat % = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. For women, an additional hip measurement is included in a modified formula.
Enter your neck, waist, and (for women) hip circumference measurements along with your height, and the calculator estimates your body fat percentage using the standard military tape-test formula.
Example: A male with a 38-inch waist, 16-inch neck, and 70-inch height would have his measurements plugged into the formula to estimate body fat percentage, which the Army compares against maximum allowable standards by age group.
How accurate is the tape-test method compared to other methods? It's less precise than methods like DEXA scans or hydrostatic weighing, but it's inexpensive, quick, and standardized, which is why it remains the practical choice for large-scale military assessments.
Why does the formula use circumference rather than skinfold thickness? Circumference measurements are easier to take consistently across a large population without specialized calipers or training, making the tape-test method more practical for routine military fitness checks.
Do body fat standards differ by age and gender in the military? Yes, maximum allowable body fat percentages are typically set differently for men and women, and often vary across different age brackets, reflecting natural physiological differences.
Can measurement technique affect the accuracy of results? Yes, inconsistent tape placement, tension, or posture during measurement can noticeably shift the calculated result, so following standardized measurement procedure is important for reliable results.
Is this the same formula used by all military branches? Body composition assessment methods can vary between branches and have been updated over time, so it's worth confirming the specific current standard used by your particular branch or program.