Body Fat Calculator
Estimate body fat percentage using the US Navy method (neck, waist, height).
How to use this tool
1
Open Body Fat Calculator
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2
Enter your data
Paste or type your input. Results appear instantly.
3
Copy or download
Export your result with one click — ready to use anywhere.
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Why use this tool
100% in-browser
Your data never leaves your device — fully private.
No signup needed
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Every tool is free with no daily limits or paywalls.
Copy & download
Export results in one click, ready to paste anywhere.
FAQ
What is the US Navy method?
It uses circumference measurements (neck, waist, and hips for women) along with height to estimate body fat percentage using a validated formula.
How accurate is this method?
The Navy method is within 3-4% of DEXA scan results for most people — accurate enough for tracking trends over time.
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