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Nutrition & Sports Medicine Anthropometric body-composition estimate Activated — circumference-based body fat estimate Routine educational estimate

Body Fat Percentage Calculator — Navy Method

Estimate body fat percentage from circumference measurements using the commonly published U.S. Navy method equations.

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Interactive tool

Calculator

Enter values carefully. Results appear after calculation and should be interpreted with the safety notes and source method on this page.

Activated — circumference-based body fat estimate

Step 1 — Enter inputs

7 fields required for this tool

Step 2 — Review the result

The result area updates below and keeps safety wording visible.

Result

Complete the form and select Calculate.

About this calculator

This calculator estimates body fat percentage using the commonly published Navy circumference method. It requires height, neck, waist or abdomen, and hip measurements depending on the equation used.

Circumference estimates are not the same as DEXA, hydrostatic weighing, or clinical body-composition assessment. Measurement technique can strongly change the result.

Source-backed
Uses the commonly published U.S. Navy circumference equations for body fat percentage. Results are estimates and depend heavily on correct measurement technique.
Review status
Activated — circumference-based body fat estimate
Limitations
Educational estimate only; not a diagnosis, prescription, or treatment plan.

Formula and method

Male equation: 86.010 × log10(abdomen − neck) − 70.041 × log10(height) + 36.76. Female equation: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387. Measurements are converted to inches before calculation.

Medical safety note: This page is for education only and should not replace professional medical advice. For emergencies, medication decisions, or severe symptoms, contact a qualified clinician or local emergency service.

Limitations and when not to rely on this result

  • Educational estimate only; not a diagnosis, prescription, or treatment plan.
  • Result depends on accurate inputs and may not apply to complex medical situations.
  • Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.

Frequently asked questions

How accurate is the Navy body fat method? +

It is a practical circumference estimate, not a direct measurement. Error can be meaningful, especially if measurement sites or tape tension vary.

Why does the female equation require hip circumference? +

The commonly published female equation uses waist, hip, neck, and height, while the male equation uses abdomen, neck, and height.

Should I use this for medical decisions? +

No. Use it for rough tracking only. Medical nutrition or body-composition decisions should use clinical context and professional guidance.

What unit should I use? +

You can enter centimeters or inches. Use the same unit for height, neck, waist, and hip.

Can athletes use this calculator? +

Athletes can use it for trend tracking, but it may not reflect muscularity or sport-specific body composition accurately.