Disputing a Failed Tape Test: Supplemental Assessments That Count
If the circumference or WHtR screen flags you, what supplemental body-fat methods are accepted, and how to request one.
By The VivMetric Editorial Team · independent editorial research project
When a dispute applies
Above the WHtR gate, the service runs a secondary body-fat evaluation. If you believe the tape was measured incorrectly, most services allow a supplemental assessment.
Accepted supplemental methods
Under AR 600-9 the accepted supplements include DXA, the Bod Pod (air-displacement), and the InBody 770 BIA where reasonably available. Home BIA scales are not accepted. Confirm the current list with your command.
How to request it
Raise the dispute through your chain of command / ABCP point of contact promptly; deadlines are short. Document measurements and request the supplemental method in writing.
Source
AR 600-9; DoD 1308.03 corridor. Data retrieved 2026-08-19.
Estimate body fat (Navy method)
Estimate body-fat % with the exact U.S. Navy circumference formula (neck + waist; hips for women).
Result
About this calculator
Estimates body-fat percentage with the U.S. Navy circumference method, using neck (and waist; hips for women) measurements.
The formula
Navy method: men BF% ≈ 86.010·log10(waist−neck) − 70.041·log10(height) + 36.76; women add a hip term. Keep units consistent (inches or cm).
Frequently asked questions
Q: How accurate is it?
A: Typically ±3–4 percentage points versus a DXA scan. Treat it as an estimate, not a lab measurement.
Q: Why include hip for women?
A: The Navy formula uses hip circumference for female measurements to account for fat distribution.
Q: What is a healthy range?
A: Roughly 10–20% for men and 18–28% for women is considered fit; your service uses its own official tables.
How to read the result
A circumference estimate is a model rather than a measurement. The Navy equation was derived by fitting tape readings against a reference method across a large sample, so it reproduces the average relationship rather than the composition of any single person. Expect roughly three to four percentage points of error against a laboratory standard, and expect that error to grow for anyone whose fat distribution sits far from the average the equation was built on.
Technique moves the result more than most people expect. The neck tape goes below the larynx and slopes downward at the front, the waist tape sits at the navel, and for women the hip tape is taken at the widest point. A single inch of error on the neck measurement shifts the estimate by about a percentage point, which is how the same person can be measured twice and receive two different answers. Track change over time with one method and treat a comparison between two different methods as meaningless.
Quick answers
Related pages
- Standards detail → /standards
- WHtR detail → /whtr
- Tool page → /tools/body-fat