How the tape test estimates body fat
AR 600-9 skips scales and calipers and uses circumference plus height. The formula is logarithmic because body volume grows faster than the tape reading does, so equal inches added at the waist do not mean equal percentage points of fat.
Maximum allowable body fat by age and sex
| Age | Men (max) | Women (max) |
|---|---|---|
| 17–20 | 20% | 30% |
| 21–27 | 22% | 32% |
| 28–39 | 24% | 34% |
| 40+ | 26% | 36% |
Come in at or under the limit for your age and you pass. Go over and you enter the Army Body Composition Program (ABCP). Women's limits sit higher across the board because women naturally carry more essential body fat.
Where soldiers lose points on technique
- Measure at the navel, level. Not at the narrowest point and not at the hip bones. Keep the tape horizontal all the way around.
- Snug, not tight. The tape should sit against the skin without compressing it; you should be able to slip a finger under. Pulling tight reads artificially low and invalidates the test.
- Average three readings. Take the measurement three times after a normal exhale and round to the nearest half inch. A single reading magnifies error.
Common questions
What measurements does the tape test need?
The classic AR 600-9 method uses circumference and height. Men measure neck and waist at the navel; women measure neck, waist and hip. Height goes into the same formula. Newer Army guidance uses a single abdominal measurement combined with height, weight and age.
How accurate is the tape test?
Within about 3 to 4 percent of underwater weighing when done correctly. The biggest source of error is technique, not the formula. Pulling the tape too tight, measuring at the wrong spot, or taking one reading instead of averaging three can swing the result by several points.
Can a very muscular soldier fail the tape test unfairly?
It can happen, because a thick, muscular waist reads as circumference the same way fat does. That is why scoring high on the ACFT, 540 total with at least 80 in every event, exempts a soldier from the body fat assessment entirely.
