Army Body Fat Calculator
The Army Body Fat Calculator estimates body fat percentage from tape measurements using the U.S. Army circumference formula, taking sex, height, neck, and waist (plus hip for women), all in inches.
What this calculator does
The Army Body Fat Calculator estimates your result instantly from the values you enter, using standard health & fitness formulas. The Army Body Fat Calculator estimates body fat percentage from tape measurements using the U.S. Army circumference formula, taking sex, height, neck, and waist (plus hip for women), all in inches. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
This tool is for general informational purposes only and is not a substitute for professional medical advice.
About Army Body Fat Calculator
The U.S. Army estimates body fat from circumference measurements rather than calipers or scales. This calculator implements that formula, using logarithms of tape measurements taken in inches.
Men enter height, neck, and waist; women also enter hip. The waist measurement must be larger than the neck for the formula to run, and the result is paired with a fat-versus-lean composition chart.
Formula & Mathematical Calculation
Result = Calculation(Army Body Fat Calculator)
Computed in real-time based on standard mathematical principles implemented in the calculator.
Calculation Example
For a male with height 70 in, neck 15 in, and waist 34 in: body fat = 86.010 × log₁₀(34 − 15) − 70.041 × log₁₀(70) + 36.76.
That is 86.010 × 1.278754 − 70.041 × 1.845098 + 36.76 = 109.986 − 129.233 + 36.76 = 17.5%.
Key Benefits
- Implements the U.S. Army circumference-based body fat formula.
- Uses separate equations for men and women, with hip included for the female formula.
- Requires only a tape measure, height, and the circumference readings.
- Displays a doughnut chart splitting estimated fat and lean mass.
How to Use this Calculator
-
Select sex
Choose Male or Female; the female formula also uses hip measurement. -
Enter height and neck
Enter height and neck circumference in inches. -
Enter waist (and hip)
Enter waist circumference in inches, plus hip if female; waist must be greater than neck. -
Calculate and read
Select Calculate and read the Estimated Body Fat percentage and composition chart.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Army Body Fat Calculator produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.