ToolNest

💪Body Fat Calculator

Estimate body fat percentage using the US Navy method.

🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup

Calculate your body fat percentage online for free using the accurate Navy circumference method.

Estimated Body Fat

17.7%

How to Use Body Fat Calculator — Step by Step

  1. 1Enter your gender, age, weight, and measurement values (waist, neck, hip for women)
  2. 2Click 'Calculate' — body fat percentage is estimated using the US Navy formula
  3. 3Your body fat category is shown — essential fat, athletes, fitness, average, or obese
  4. 4View the healthy body fat range for your gender and age group

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Frequently Asked Questions

Is this tool completely free?

Yes. All ToolNest tools are 100% free with no signup required, no account, and no watermarks added to output files.

Are my uploaded files secure and private?

All uploads use HTTPS encryption during transfer. Files are processed on secure isolated servers and automatically deleted within 2 hours of upload.

Does this tool work on mobile phones?

Yes. ToolNest works on any modern browser on iPhone, Android, tablet, or desktop — no app download or plugin needed.

Do I need to create an account?

No. Just open the tool, upload your file, and download the result. No email, no signup, no password.