# Body Fat Percentage Calculator (U.S. Navy Method)

Calculate your body fat percentage using the U.S. Navy method. Get an estimate based on simple body circumference measurements with ACE classification.

## What this calculates

Estimate your body fat percentage using the U.S. Navy circumference method. This formula uses measurements of your waist, neck, and height (plus hip for women) to provide a reliable estimate without special equipment.

## Inputs

- **Gender**
- **Height** (cm) — min 50, max 300
- **Waist Circumference** (cm) — min 30, max 200 — Measure at the narrowest point (navel level for men)
- **Neck Circumference** (cm) — min 20, max 80 — Measure just below the larynx (Adam's apple)
- **Hip Circumference (Women only)** (cm) — min 40, max 200 — Measure at the widest point of the hips (women only)

## Outputs

- **Body Fat Percentage** — formatted as percentage — Estimated body fat percentage (U.S. Navy method)
- **Fat Mass Category** — formatted as text — Body fat classification based on ACE guidelines
- **Note** — formatted as text — Additional information about the result

## Details

The U.S. Navy body fat formula was developed by Hodgdon and Beckett at the Naval Health Research Center. For men, the formula is: BF% = 86.010 × log₁₀(waist – neck) – 70.041 × log₁₀(height) + 36.76. For women: BF% = 163.205 × log₁₀(waist + hip – neck) – 97.684 × log₁₀(height) – 78.387. All measurements are in centimeters. While not as precise as DEXA scans or hydrostatic weighing, this method provides a reasonable estimate that correlates well with more sophisticated techniques.

## Frequently Asked Questions

**Q: How accurate is the U.S. Navy body fat method?**

A: The U.S. Navy method typically has an error margin of 3–4% compared to more precise methods like DEXA scanning. It is considered one of the most reliable tape-measure-based methods and is used by the U.S. military for fitness assessments.

**Q: What is a healthy body fat percentage?**

A: Healthy ranges vary by gender and fitness level. For men, 14–24% is considered average/healthy, while athletes may be 6–13%. For women, 21–31% is average/healthy, while athletes may be 14–20%. Essential fat (minimum for health) is about 2–5% for men and 10–13% for women.

**Q: How should I take the circumference measurements?**

A: Use a flexible tape measure. For the waist, measure at navel level for men or the narrowest point for women. Neck should be measured just below the larynx. Hip (women) should be at the widest point. Keep the tape snug but not compressing the skin, and measure in the morning before eating.

**Q: Is this calculator a substitute for medical advice?**

A: No. This calculator provides an estimate for informational purposes. For accurate body composition analysis and health advice, consult a healthcare professional who can use clinical-grade methods and consider your full health profile.

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Source: https://vastcalc.com/calculators/health/body-fat
Category: Health & Fitness
Last updated: 2026-04-21