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.
How to use Body Fat Calculator
- Choose your sex and enter measurements in inches (waist, neck, hip for women, height).
- Measure waist at the navel and neck below the Adam’s apple.
- 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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