Military Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy circumference (tape) method used in military fitness assessments.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
This tool provides general educational estimates only and is not medical advice. It does not diagnose, treat, or replace guidance from a qualified healthcare provider. Consult a doctor for decisions about your health.
About the Military Body Fat Percentage Calculator
The military body fat calculator uses the U.S. Navy tape-measure method, the same circumference formula the U.S. armed forces have used for body composition screening. It estimates body fat percentage from height, neck circumference and waist circumference (plus hips for women), using logarithms of those measurements. The method is quick, needs only a tape measure and is consistent when measurements are taken the same way each time, though it can differ from laboratory methods by several percentage points.
How to use it
- 1Select your sex.
- 2Enter your height.
- 3Measure your neck just below the larynx, with the tape sloping slightly down to the front.
- 4Measure your waist at the navel (men) or at the narrowest point (women); women also enter hip circumference.
- 5Press Calculate to see your estimated body fat percentage.
Worked example
a man 178 cm tall with a 38 cm neck and an 85 cm waist has an estimated body fat of about 16.4%.
How it works
Formula (US Navy)
Men: %BF = 495 / (1.0324 − 0.19077·log10(waist−neck) + 0.15456·log10(height)) − 450
Women include hip circumference in the equation.
Who it is for
Service members preparing for a body composition check and anyone wanting a simple, repeatable body fat estimate.
Why it helps
It uses the same method as official screenings, so you can check where you stand beforehand.
Common use cases
- Preparing for a military body composition assessment
- Tracking body fat changes during training
- Comparing tape-measure results with other methods
Frequently asked questions
A:It is a reasonable field estimate but less precise than DEXA or hydrostatic weighing.
A:Men measure at the navel; women at the narrowest point. Measure the neck below the larynx.
Reviewed for accuracy · Last updated October 7, 2026
Formulas follow recognised clinical references — including WHO BMI classifications, the Mifflin-St Jeor equation, and Naegele’s rule — and are periodically checked against published reference values.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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