Army Body Fat Calculator

Enter neck, waist, height, and — for women — hip measurements to estimate body fat percentage using the US Army's circumference-based formula.

How to Use the Army Body Fat Calculator

Select male or female before filling in the tape measurements — the women's formula needs an extra hip figure the men's doesn't, so that field only appears once you switch.

The US Army uses its own circumference-based formula for body composition screening under AR 600-9, the Army Body Composition Program — related to the Navy method in spirit, but fit against a different dataset and expressed in inches rather than centimeters, so the two don't plug into each other's numbers.

Men:   %BF = 86.010×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76
Women: %BF = 163.205×log₁₀(waist+hip−neck) − 97.684×log₁₀(height) − 78.387

Measurements in inches, log base 10. Waist is taken at the point of minimal circumference (roughly navel level), neck below the larynx, hip at the widest point for the women's formula. This calculator uses the standard AR 600-9 formula for a general estimate — actual Army body composition assessment follows a stricter measurement protocol with trained tape administrators, and the official standard also factors in age and sex-specific allowable limits this tool doesn't apply.

Treat this as an estimate in the same family as the Army's method, not an official readiness screening result — the real assessment happens with a tape, a trained measurer, and the current regulation on hand.

Not an official Army readiness result. This tool reproduces the AR 600-9 formula for general estimation only — it isn't administered by a trained measurer and doesn't apply the regulation's age/sex allowable limits. For an actual assessment, consult unit guidance and the current regulation.