Army calculator tool

Body Fat Percentage Calculator

Estimate body-fat measurements and understand their relationship to Army body-composition screening.

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How to Use This Calculator

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How Body Fat Percentage Calculator turns inputs into an estimate

Enter only the values requested by this tool and keep units consistent.

Enter your sex and height, then provide your neck and waist circumference measurements. Women should also enter hip circumference. All measurements should be in inches, taken on bare skin with a flexible tape pulled snug but not tight.

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Body Fat Percentage Calculator

Enter your values to generate a personalized planning estimate.

Your result

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Enter your values to calculate.

Planning estimate only. Confirm official standards, scoring tables, and procedures with current service guidance.

About the Body Fat Percentage Calculator

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What the Body Fat Percentage Calculator helps you understand

Repeat measurements under similar conditions for a more useful trend.

This Body Fat Percentage Calculator uses the same circumference-based formula developed for the Department of Defense but is designed for anyone interested in estimating their body composition. The Hodgdon-Beckett formula correlates well with more expensive methods like DEXA scans and hydrostatic weighing for most body types, making it a practical free alternative. Unlike BMI, which only considers height and weight, this method uses actual body measurements to distinguish between fat mass and lean mass. It is particularly useful for fitness enthusiasts, personal trainers, and anyone monitoring body composition changes during a diet or training program. The formula uses the natural logarithm of circumference measurements, which means small changes in waist or neck size can produce meaningful shifts in the calculated percentage.

Use the current official procedure for any administrative determination.

Body Fat Percentage Calculator FAQs

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Use the Body Fat Percentage Calculator FAQ guide

Check the calculator labels before entering a value.
Is this the same formula the military uses?+

Yes, this calculator uses the Hodgdon-Beckett formula, the same logarithmic circumference-based method used by the U.S. Department of Defense for body fat estimation since the 1980s.

How does this compare to a DEXA scan?+

The circumference method typically agrees with DEXA within 3-5% for most people. DEXA is more precise and provides regional fat distribution data, but requires expensive equipment and a clinical visit.

What is a healthy body fat percentage?+

For adult males, 10-20% is generally considered fit, with 6-13% being athletic. For adult females, 18-28% is fit, with 14-20% being athletic. Essential fat minimums are about 3-5% for males and 10-13% for females.

Can I use centimeters instead of inches?+

This calculator uses inches. To convert from centimeters, divide your measurement by 2.54. For example, a 90 cm waist is approximately 35.4 inches.