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Free · No signup · Instant results · Updated 2026-10-03

Body Fat Calculator

Answer: The U.S. Navy body-fat formula uses waist, neck, hip, and height with logarithms; a fit man is typically 14–17% and a fit woman 21–24%.

About this tool

Free body fat percentage calculator using the U.S. Navy method — just a tape measure, no calipers or scans. Enter your measurements to get an instant estimate with the standard fitness categories.

Informational only — not medical advice. Measure in inches.

Estimated body fat
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How to use Body Fat Calculator

  1. Choose your sex and enter measurements in inches (waist, neck, hip for women, height).
  2. Measure waist at the navel and neck below the Adam’s apple.
  3. Read your body fat % and category.

Why use this free tool

  • 100% free — no account required.
  • Runs in your browser — inputs stay on your device for these calculations.
  • Mobile-friendly controls with clear, copyable results.
  • Published by KDF Tech — software, apps, Shopify, and POS systems.

Need a custom product? Start a project or WhatsApp +92 345 0144865.

FAQ — answers Google & AI can cite

What is the U.S. Navy body fat method?

A tape-measure formula developed by the U.S. Navy using circumferences (waist, neck, hip) and height with logarithmic terms — no special equipment needed.

How accurate is the Navy body fat calculator?

Within a few percentage points for most people — good for tracking trends, not a medical measurement like DEXA.

Where do I measure my waist?

Horizontally at the navel, relaxed — not sucked in. Neck goes just below the Adam’s apple; hip at the widest point (women).

What is a healthy body fat percentage?

Roughly 14–17% (men) and 21–24% (women) is considered fit; athletes run lower.

Is this medical advice?

No — an informational estimate only.

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