How to use the Army Body Fat Calculator
This calculator uses the circumference method that the U.S. Army and Navy use to estimate body fat.
Open the Army Body Fat Calculator →
What you need to enter
- Sex
- Height (cm)
- Weight (kg)
- Neck (cm)
- Waist (cm)
- Hip (cm, women)
The formula
The same Navy formula: log of waist minus neck (men) or waist plus hip minus neck (women), with height.
Worked example
Using the default values in the calculator:
- Sex: Male
- Height (cm): 175
- Weight (kg): 75
- Neck (cm): 38
- Waist (cm): 85
- Hip (cm, women): 95
| Body fat | 16.9% |
| Fat mass | 12.7 kg |
| Lean mass | 62.3 kg |
Tips for better results
- Check the current standards for your age and sex.
- Re-measure if the result seems far off.
Common mistakes to avoid
- Pulling the tape too tight or loose.
- Comparing with standards from another service.
Please note: Health calculators and guides give general estimates, not medical advice. Talk to a doctor or other qualified professional about your own health. See our Disclaimer.