Body Fat Calculator (US Navy Method)
Estimate body fat percentage from height, neck, waist and hip measurements using the US Navy formula, with fat and lean mass.
Runs on your device
Result
Results appear here as you type.
What it does
All you need is a tape measure. Measure the neck below the larynx, the waist at the navel (men) or narrowest point (women), and the hips at their widest (women).
How to use it
- Enter sex, height, weight and measurements.
- Use the same units throughout.
- Read body fat, fat mass and lean mass.
Example
The example fills in realistic values and runs the tool. Select Try an example above to see it.
When it helps
- Tracking progress when weight barely changes.
- Fitness assessments.
- Comparing with smart scale readings.
Questions
How accurate is it?
Typically within 3 to 4 percentage points of lab methods, provided you measure carefully.
What is a healthy range?
Roughly 14 to 24% for men and 21 to 31% for women (American Council on Exercise ranges).
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