Army Body Fat accuracy and testing

Formula source

• The Army uses a circumferential method to estimate body fat. * **Males:** Body Fat % is calculated using Height, Neck, and Waist. A larger neck relative to the waist lowers the estimated body fat. * **Females:** Body Fat % is calculated using Height, Neck, Waist, and Hips. The result is compared against age-adjusted maximum allowable limits.

Test cases

Known limitations

• This is an estimation. It is known to overestimate body fat in lean individuals with thin necks and underestimate it in individuals with thick necks.

Assumptions

• The estimate assumes accurate neck, waist, height, and hip measurements taken in inches using Army-style tape-test rules.
• Male and female calculations use different measurement sets and age-based compliance thresholds.
• This tool estimates body fat from circumference measurements rather than from direct body-composition testing, and it does not replace the full official screening process.

Unit handling

• Gender accepts one of the configured options.
• Age accepts numeric values.
• Height accepts values in in.
• Neck accepts values in in.
• Waist accepts values in in.
• Hip (Women only) accepts values in in.
• Body Fat % is displayed as a percentage.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Percent outputs are displayed with two decimal places.

Version history

Change log