Health & fitness
Body fat estimate
Estimate body-fat percentage from BMI, age and sex coefficient.
Calculators / Health & fitness / Army body-fat estimate
Army body-fat estimate calculator
Estimate body-fat percentage using circumference inputs and the U.S. Army-style logarithmic model.
On this page
Estimated body fat25.78%
Calculator controls
How to calculate
Estimate body-fat percentage using circumference inputs and the U.S. Army-style logarithmic model.
Estimated body fat = 86.01*log(waist-neck)-70.041*log(height)+36.76
Worked example
Waist circumference (cm): 90; Neck circumference (cm): 40; Height (cm): 175.
Estimated body fat: 25.78 %.
Assumptions and limits
This example uses the male circumference equation. Measurement location, sex-specific equations and service standards matter; verify the applicable official method.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate body-fat percentage using circumference inputs and the U.S. Army-style logarithmic model. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the army body-fat estimate to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Waist circumference (cm) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Neck circumference (cm) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Height (cm) | Enter a number of at least 0.000001 and no more than 1000000000000. |
Frequently asked questions
What should I check before using the army body-fat estimate result?
This example uses the male circumference equation. Measurement location, sex-specific equations and service standards matter; verify the applicable official method.
Is this army body-fat estimate result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.