Health & Fitness Toolbody fat calculatorUpdated 2026

Body Fat Percentage Calculator (US Navy Method)

Estimate your body fat percentage and lean muscle mass using tape measurements according to the US Navy protocol.

Circumference Measurements

cm
cm
Estimated Body Fat Percentage
17%
Calculated via official US Navy Tape Formula
Estimated Fat Mass
12.8 kg
Lean Muscle & Bone Mass
62.3 kg
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How Body Fat Calculator Works: Mathematical Formula & Steps

Estimates relative fat mass percentage using anatomical tape measurements, validated by the Department of Defense against hydrostatic underwater weighing.

US Navy Body Fat Circumference Formula
Men: 495 / [ 1.0324 − 0.19077×log₁₀(waist−neck) + 0.15456×log₁₀(height) ] − 450
Where:
  • Waist (Waist Circumference): Measured at the narrowest point or navel level.
  • Neck (Neck Circumference): Measured just below the larynx (Adam’s apple).
  • Hips (Hip Circumference): Measured around the widest buttocks protrusion (women only).

Worked Real-World Example: Step-by-Step Calculation

To illustrate how the body fat calculator works in practice, consider the following real scenario:

Male with 85 cm Waist, 38 cm Neck, 175 cm Height

Scenario: Waist = 85 cm, Neck = 38 cm (Waist − Neck = 47 cm), Height = 175 cm.

Step 1: Compute log10(Waist − Neck)
log₁₀(47) = 1.6721
Step 2: Compute log10(Height)
log₁₀(175) = 2.2430
Step 3: Apply US Navy coefficients
Estimated Body Fat ≈ 15.8%
Final Result: Body fat is estimated at 15.8% (Fitness Category). For a 75 kg man, fat mass is 11.85 kg and lean mass is 63.15 kg.

Key Takeaways & Best Practices

  • More informative than BMI because it differentiates between muscular mass and adipose tissue.
  • Take measurements consistently in the morning before eating for repeatable accuracy.

International & Multi-Currency Standards

Whether you are evaluating calculations in the United States (USD), United Kingdom (GBP), Eurozone (EUR), South Africa (ZAR), Australia (AUD), Canada (CAD), or India (INR), everycalculator dynamically formats outputs according to regional accounting notations and dual metric/imperial conversions.

Related Search Terms & Common Queries

This calculator is designed to provide immediate answers for popular search queries including:

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Frequently Asked Questions

What is a healthy body fat percentage?

For men: Essential fat is 2-5%, Athletes 6-13%, Fitness 14-17%, Average 18-24%, Obese 25%+. For women: Essential fat 10-13%, Athletes 14-20%, Fitness 21-24%, Average 25-31%, Obese 32%+.

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