Body Fat Percentage Calculator
Body fat estimate from the US Navy method.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Body Fat Percentage Calculator
How to use this tool
- Enter your values in the fields above.
- Press Generate. The result appears below the buttons.
- Use Load sample to see a worked example, or Clear to start again.
Worked example
For a man 180 cm tall with a 40 cm neck and 90 cm waist: the US Navy formula gives 18.4% body fat (waist minus neck is 50 cm).
What this tool does not do / Limits
This is an estimate from the US Navy method, not medical advice and not a measurement. Tape measurements are easy to get wrong, and the formula is less accurate for very muscular, very lean or older people.
Frequently asked questions
Where do I measure the waist?
Around the navel, with the tape level and snug but not tight, at the end of a normal breath out.
Why is hip needed for women but not men?
The women's US Navy formula uses waist plus hip minus neck, while the men's formula uses waist minus neck.
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