Body Fat Calculator (US Navy Method)
Body fat calculator using the US Navy tape method: body fat percentage from height, waist, neck and (for women) hip measurements.
% = 495 / (1.0324 − 0.19077 log(waist − neck) + 0.15456 log(height)) − 450
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
Measure the waist at the navel, the neck just below the larynx and, for women, the hips at their widest point.
The method is typically within 3–4 percentage points of lab measurements.
For general information only; it does not replace advice from a doctor or other health professional.
Frequently asked questions
Body fat for a 178 cm man with an 85 cm waist and 38 cm neck?
About 16.4 %, in the fitness range.