Body Fat Percentage Calculator
Get a US Navy body fat estimate as you type.
FREE - NO SIGN-UP - RUNS ON YOUR DEVICE
Your entries stay on your device
- Liveupdates as you type
- 0data uploaded
- 1clear result
- Freeno account needed
What you can count on
- 0data sent
- Calculations run in this browser
- Entries stay on this device
- Liveresult
- Figures update as values change
- Copy the summary when ready
- Clearmethod
- Inputs and formula basis shown
- Estimate, not medical advice
Body Fat Percentage Calculator at a glance
- Input
- Sex, height, neck, waist, hip measures
- Output
- a US Navy body fat estimate
- Health notice
- Estimate, not medical advice
- Processing
- Runs locally in your browser
- When it refuses to answer
- Outside 0–75% is refused
- Price
- Free
- Account required
- No
How to use Body Fat Percentage Calculator
- 1
Enter your values
Enter sex, height, neck, waist and hip measurements.
- 2
Review the estimate
See the circumference-based estimate and the measurements used.
- 3
Copy the result
Use Copy result to save the displayed summary for your own notes.
Frequently asked questions
Is this result medical advice?
No. It is a general estimate based on the values and formula shown. A qualified health professional can interpret measurements for your circumstances.
Are my entries uploaded?
No. The calculation runs in your current browser tab, and the tool does not send the values to a server.
Why might my result differ elsewhere?
Methods, rounding and reference assumptions vary. Check the selected units and inputs, then treat the result as an estimate rather than a diagnosis.
I changed the hip measurement and nothing moved. Why?
The Navy formula for men uses height, neck and waist only. The hip box stays on screen so the form is the same for everyone, but it is not read. For women it is.
Understanding the estimate
Enter sex, height, neck, waist and hip measurements. See the circumference-based estimate and the measurements used. This calculator provides an estimate, not medical advice.
- The result follows the method named in the tool and rounds figures for easy reading.
- Personal circumstances vary, so use the figure as a general reference and not a diagnosis.
Full specification
| Input | Enter sex, height, neck, waist and hip measurements. |
|---|---|
| Output | See the circumference-based estimate and the measurements used. |
| Health notice | This result is an estimate for general information and is not medical advice. |
| Processing | All calculations run locally in the current browser tab. |
| When it refuses to answer | A result below 0 or at 75 percent and above is reported as a measurement problem, not printed. The formula cannot speak for those. |
| Price | Free |
| Account required | No |
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